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Home made suppressors

Geoff 1 Comment

As long as there have been firearms, there have been people trying to improve their performance. Quicker, quieter, lighter, more accurate – these are the motivations of the backyard tinkerer, qualified gunsmith, field armourer and firearms designer alike.

A suppressor, otherwise known as a silencer, sound moderator or sound suppressor, has always been a favoured project for the budget-minded or mechanically curious. One such person recently listed a “V” can suppressor on Trademe, and I couldn’t help but get in touch.

Alan from Hamilton took it upon himself to build a “can suppressor”. The term can suppressor came about as sound moderators tend to look like a beverage can, especially the thicker muzzle-forward variety. This example is literally made from a V can.

The Trademe listing humorously asks;

“Do you want to give your bullets “A guarana and caffeine charged V energy Woo-Hoo”?”

And the answer should be, “Yes, yes I do.”

The tech specs

The top (the end that you drink from) is cut out, and has been replaced with a moulding of ultra high molecular weight polyethylene (UHMWPE). If you just got totally lost, replace UHMWPE with plastic and you’ll get the general idea. This is then drilled and tapped to accept a male 1/2x20UNF thread, the most common thread for rimfire rifles. There’s always the exception, like the Ruger 10/22 anniversary edition, but hey, what can you do?

V can suppressor
The exit hole is cut with a subsonic hollow point.

The other end of the can is a blank canvas, waiting for your first round to punch a perfectly lined-up exit hole. Two things about this. Firstly, it does produce a jagged edge. You could deburr this if you like, but realistically, because it sits below the rim of the can, you probably won’t get your fingers anywhere near it. Secondly, use a subsonic round to do this.

Not only is there less chance of developing too much pressure in the contained environment, but the hollow point should help you create a slightly oversize hole for the following rounds to fit through easily.

The good and the bad

Well, on the positive side, it’s dirt cheap to make if you’ve got the skill. And if Alan chucks a couple more up on Trademe, they are pretty inexpensive to buy – not that economy rimfire suppressors are hard to come by. Also on the plus side of the list is the novelty factor. If we’re honest, everyone’s going to want to check it out and have a go. Lastly, it’s very, very light.

Does it reduce sound? Remarkably – especially when compared to not having a suppressor on at all. In a follow up post, I will do a proper test with a sound meter. The test will be done with two barrel lengths – 16″ and 22.5″ – and with three different sized cans, compared to a regular suppressor and a bare muzzle.

Unfortunately due to technical difficulties, we weren’t able to capture all five rounds I put through the can on video, but we did get the last one. For comparison, listen to how loud it is when I work the bolt afterwards.

On the negative side, you won’t be able to try this trick with a centrefire rifle – you’ll likely end up with a pretty, green mess at the end of the barrel. Also, because this is a relatively simple construction without baffles, the sound is “tinny” – excuse the pun – even if it is reduced.

Of course, being made out of a drink can means that it isn’t the sturdiest object in the world, and if you whack it into a tree or drop it on the ground, you’ll probably end up with a very skew and unusable suppressor. Of course, you didn’t think it was going to be a hardy, hunting-ready solution, did you?

At the end of the day, for a very reasonable cost, you get a novel sound-reduction solution that will help you keep the noise down at the range or in a field full of rabbits or possums. If you do plan on taking it out in the bush, take care of the muzzle end of your rifle – which is much easier with a short or cut-down barrel. For bush use, you should probably think of this as a disposable option. And at such a low cost – why not?

The top right target is 5 CCI SV rounds put through the V can suppressor, showing no loss in accuracy. The bottom left is the initial HP Sub through the bottom of the can.
The top right target is 5 CCI SV rounds put through the V can suppressor, showing no loss in accuracy. The bottom left is the initial HP Sub through the bottom of the can.
Modified M38 bolt.

Why I will never use my safety

Geoff 3 Comments

If you’ve gone through the effort of getting your firearms licence, you’ll have come across seven neat rules that should dictate the way you handle guns for the rest of your life. These are the foundation of the arms code and are as follows:

Rule 1: Treat every firearm as loaded
Rule 2: Always point firearms in a safe direction
Rule 3: Load a firearm only when ready to fire
Rule 4: Identify your target beyond all doubt
Rule 5: Check your firing zone
Rule 6: Store firearms and ammunition safely
Rule 7: Avoid alcohol and drugs when handling firearms

You’ll notice, not one of these is “apply the mechanical safety on your firearm”. Why is this? Mechanical objects fail due to wear and tear, extreme conditions and pure bad luck. If you’ve read the instruction manual that comes with your new rifle or shotgun (highly recommended activity), you’ll notice that while new and improved safeties are always created for weapons and mentioned in these manuals, they usually discourage you from relying solely on these little switches.

How does a safety work?

There are two ways that most safeties work. The first is that they block the trigger from being pulled back, or even disconnect the trigger mechanism. The other is that they block the striker or hammer from moving forward and contacting the firing pin. There are many, many other types of safeties, and they can be in different places on your firearm, but they all have one thing in common – they are small bits of material upon which a large responsibility hangs.

That is why you never rely solely on a safety. Now – this my preference – I prefer not to use the safety at all. Some ranges will require your safety to be applied, and that’s fine. But, I personally don’t want to build up a reliance on a little switch.

What do I do instead?

When on the range and not using the rifle, I have it pointed in a safe direction with the action open, magazine out (or empty) and a breech flag in the chamber. This indicates to everyone that firearm is unloaded and safe.

When carrying a firearm to or on the range, same applies. Magazine out or empty (if fixed), and safety flag in or thumb in the chamber – muzzle pointed in a safe direction.

When firing on the range – well, you’re firing. What good is a safety when you want it to go bang?

When carrying a rifle in the field… This is where it gets a bit tricky. I leave my ammunition in my pocket, as well as my bolt if it’s a bolt action, until I’m near where I want to be shooting. When I am in the area in which I want to shoot, I fit the bolt (or close the action on a semi), and load the ammunition.

At this point, I do not chamber a round. I close the bolt on an empty chamber by pushing the top round down with my thumb or inserting the magazine on a closed bolt. When you’re ready to line up your shot, rack the bolt and get ready to squeeze the trigger.

If your quarry eludes you – drop the magazine out and remove the chambered round. Double check to see there’s nothing in there and close the bolt on an empty chamber before inserting your magazine again. Or, push the top round down on your bolt action.

This is just my personal procedure – you may have different feelings on the matter, or experience to the contrary. Leave a comment below with your tips on firearm safety.

Check out the arms code here.

Cutting down a .22

Geoff 1 Comment

Sporter barrels on .22s are usually long and thin. This means they’re lighter when carried in the field, but they can also be whippy and harder to control than bull-barrelled rifles. Another way to achieve that relative stiffness in the barrel is to reduce the length of it.

I’ve had two Norinco JW-15s, and while the 22.5-inch barrel is okay, the 16-inch barrel is a real shooter. If you head on over to nzrimfire.com you’ll find plenty of people who have taken full length Norincos and cut them down to as little as 13 inches with great success. I guy I used to shoot with cut his down to 14 inches and found no drop off in accuracy.

Thankfully in New Zealand there are no minimum barrel length laws, just minimum overall firearm length rules – which means you can take full advantage of this, and make your rifle more manoeuvrable, easier to get in and out of your truck and pretty accurate to boot. In the video below I’m shooting an old Voere that I bought for parts – the barrel has been cut down to 8 inches and lets out a little burst of flame with standard velocity CCI.

So, what is the trade off with cutting down your .22? Well, you can burn off all the powder in your average .22LR case in about 12 – 13 inches of barrel. However, you still won’t have achieved maximum muzzle velocity. You’ll also get more variation in muzzle velocity, as the longer barrels allow for a more consistent burn, resulting in a more consistent muzzle velocity. While you can still gain a lot more speed out of a longer barrel, 16 inches is often said to be the “sweet spot” for .22s.

.22LR cases on bench
The humble .22LR doesn’t need too much barrel to burn it’s full powder capacity.

After that point, muzzle velocity still increases, but in much smaller increments per inch, and your follow through becomes much more important. I suppose if you wanted to teach yourself excellent shooting habits, a target rifle with a 28 or 30-inch barrel would be ideal. However, if you just want a nice shooter, go for a 16-inch tube, or do it yourself if you have the confidence/competence. Some manufacturers do release 13 and 14 inch options for their rifles (Anschutz has a 14-inch sporter), however, if you’re doing the job yourself, give it the extra couple inches to be on the safe side. I guess I should put my money where my mouth is and trim down that 22.5-inch Norinco… Oh well, add it to the list.

3 gifts you can buy for a shooter or hunter

Geoff Leave a comment

It can be hard to find the perfect gift for someone. It can be harder if they’re into shooting and you’re not – harder still if you don’t have a firearms licence and can’t legally purchase the things they would like. However, there are a few go-to things you can consider, and they won’t break the bank either.

Things made out of ammo that aren’t ammo

Shooters like things that go bang. However, the next best things might be something that looks like it goes bang. However, not all mementos are created equal. Ask any golfer, and they’ll tell you every year they get terrible golf-club or golf-ball shaped items to bury in a draw somewhere. Every now and then they get something that’s actually kind of cool. It’s pretty similar for hunters.

It's hard to find a cooler bottle opener than this .50 cal case from Gunworks.
It’s hard to find a cooler bottle opener than this .50 cal case from Gunworks.

A barbecue lighter shaped like a shotgun may not get someone’s juices flowing, but a bottle opener made out of a .50 cal. case with a 750 gr A-MAX projectile seated in it might just get the right reaction. Yeah – 750 grains – that’s four to five times the average .308 projectile weight. My wife and I got one for my father-in-law last Christmas – and I liked it so much I got myself one too. The brass is obviously softer than bottle caps and will mark after use, but hey, it looks so freakin cool. You can get them from Gunworks in Christchurch, and because it’s not live ammo it can be sent anywhere. They have other options too.

Another cool ammo-looking option can be cuff links. These can be done poorly or very well, so be selective. The imitation 12-gauge cuff links my wife got me are not only well made, but look pretty damn good too.

A magazine subscription

If you’re significant other or best friend has a hunting magazine lying around but they don’t have a subscription to it, that could be a great option. Look for the subscription page and photocopy or scan it, or find the magazine’s website. It’ll be pretty obvious if you tear out the page…

Make sure to take a picture of the product code so you can find what you need at the store.
Make sure to take a picture of the product code so you can find what you need at the store.

While everything and anything can be found on the internet, gun magazines are a great way for shooters to enhance their knowledge of local shooting spots, new equipment or competition results.

Reloading supplies

Well, you can’t buy ammunition for your partner if you don’t have a licence, but if they reload, you can buy them everything they need to make their own. You’ll still need to have ID, as primers and powder are explosives.

How do you know what to get? Go over to their shooting bench and see what’s running low. Make sure to take a picture of the item or the product code to show the guys at the gun store. Also, make sure to shop around. When you’re spending near a hundred bucks on projectiles or a box of primers, looking at different websites or stores can save you around 10 per cent.

Projectiles running low? Gift idea right there.
Projectiles running low? Gift idea right there.

Should I clean my .22LR barrel?

Geoff Leave a comment

There are many opinions, myths and vagaries about rifle cleaning. Some will tell you to clean and polish your bore after every trip to the range, others will tell you cleaning your rifle is a waste of time or a bore snake will do the trick. However, one thing’s for sure – maintaining your .22 is completely different.

What’s the difference?

Whether it’s rimfire or centrefire, some fouling is often needed to get a barrel shooting to the same, reliable point of impact. Lead rimfire projectiles are much softer copper-jacketed bullets, doing minimal damage to the bore, and the lead deposits left in the barrel don’t do any harm either. Copper not only wears down the barrel, but leaving it in the bore can lead to quicker deterioration of the rifling after subsequent shots.

So, the question then becomes – if fouling is good and lead isn’t harming your barrel, why would you clean your .22?

This picture shows how a clean barrel walks to its point of impact once it fouls up.
This picture shows how a clean barrel walks to its point of impact once it fouls up.

How often to clean your .22LR barrel

I don’t personally clean my barrel very often. The standard is “when accuracy starts dropping off”. And to be honest, I’ve never got to that point. I give my .22 a couple pulls through with the bore snake and some Hoppes No. 9 after a couple thousand rounds – give or take a few. But, lead crud is nasty on the action.

I mainly shoot bolt action when I’m shooting rimfire, which means I can feel when the bolt starts getting stiff or it doesn’t feed nicely. Semi-autos tend get gummed up a bit more, as gasses from firing come back into the action. What to do? Use some bore solvent and angled brushes, cotton swabs or cloth to clean the gunk out. Every now and then disassembling the bolt or action could be necessary to ensure reliable functioning. Some shooters also like to clean up the crown, however, I shoot with a suppressor, so I’m not super-fussed on that score.

If you have any questions or tips for cleaning your rifle – share them in the comments below.

PPU 7.62X39

Product review: Prvi Partizan ammo

Geoff 4 Comments

Prvi Partizan ammo has been on the market for years – decades even – but has only just started to make an impact in New Zealand. Or so you thought. Abbreviated to PPU, Prvi Partizan as we know it today has been around since the 1940s, although the company traces its roots back to the late 1920s and has had a few different names as wars and politics have shaped Europe.

My Serbian friend tells me it’s pronounced “pr-ah-vi”, not “privvy” as most people sound it out. It translates roughly to “first partisan” and gets its name from the long and thing rifles produced for partisan forces by the factory in earlier years.

War – what is it good for?

Well, most of the sporting arms and ammunition we enjoy today share their history with their military counterparts. A tonne of the most popular hunting and sporting cartridges today are military cartridges from the past 100 years or more, including:

  • 7.62×51 NATO (.308)
  • 5.56×45 NATO (.223)
  • .300 AAC Blackout
  • 7.62×39
  • 7.62x54R
  • 6.5×55
  • 7.5×55
  • 7.92×57 Mauser
  • 30-06
  • .303
  • .338 LM
  • .50 BMG
The price of PPU makes it hard not to stock up.
The price of PPU makes it hard not to stock up.

Not to mention the endless array of pistol ammunition too. Of course the search for bigger, better and boom-ier things has led to a surge in development in the cartridge market today, much of which is driven by shooters who demand a high level of accuracy. Ammunition that used to only be available to wildcatters for varminting or bench rest shooting is now common place in the USA and is making its way over to New Zealand as well. Rimfire is also growing in leaps and bounds with the .17 WSM making waves in the shooting community.

But what about those stalwarts of scrub hunting and cheap and cheerful plinking? The cut down .303 bush guns and the semi-auto fun-makers in 7.62×39? Well, PPU is your knight in shining armour. For those that love shooting their military calibre rifles without breaking the bank, the ammunition produced by Prvi Partizan is worth your consideration.

On the plus side

While you might think Prvi hasn’t been in the New Zealand market for a while, it actually has. If you’ve shot Highland ammo, you’ve shot PPU. It’s the brand they’ve been using down here. In terms of military cartridges, Highland hasn’t been the cheapest, but it’s a step up from the dirty steel-cased stuff from Russia. It’s certainly better than putting corrosive ammo through your firearms, especially if you’re not that thorough with your cleaning.

Annealing marks on .303 and 7.62x39 PPU factory rounds.
Annealing marks on .303 and 7.62×39 PPU factory rounds.

Prvi Partizan ammunition is brass cased and generally considered to be good brass for reloading. Many Swedish Mauser fans rate the 6.5×55 PPU brass behind Norma and Lapua, but ahead of the American-made stuff. In terms of how soft or long-lasting it is, I can’t personally say. I’m on my second round of firing with this lot of brass and haven’t seen anything untoward yet, but we have a ways to go before anything should be cropping up. When I do get my brass into the higher firing counts I’ll post again to let you know, but considering I have over 140 cases for 6.5×55 alone, I doubt that will be any time too soon.

Considering how good the brass is, it’s certainly worth the price. This is especially the case with calibres like the .303 where you might only have a few options, all of which are more expensive. Not only do you get an acceptable level of accuracy out of it, but you have (I’m guessing) between 6 and 10 more reloads out of them – if not more.

What is the cost? I’ve seen the blue boxes cropping up in a few stores around the country and they’ve ranged in price from $31 to $36 for big rounds like the .303 and 6.5×55. The 7.62×39, which I’ve bought for a reloading experiment, runs at around $30, but if you go to the right Hunting & Fishing, you can pick it up for $25. Most stores will give you a bulk discount if you buy a few packets anyway.

How accurate is it? Well, how long is a piece of string? How accurate a particular round is will be determined by many contributing factors, not least of which are shooter skill and the particular firearm in question. The picture below shows PPU 139gr FMJ 6.5×55 three shot test groups, one is about 1.5 MOA and the other is 2.6 MOA. These are shot from my cut-down 20.5″ barrelled Husky M38. The other target, for comparison, is another reasonably priced brand, Sellier & Bellot 140gr SP, at 2.4 MOA.

PPU 139 gr FMJ and S&B 140 gr SP
PPU 139 gr FMJ and S&B 140 gr SP

 

This is not bad, considering many are happy to get 3 or 4 MOA groups with milsurp rifles and cheap ammo. However, you don’t get many people bragging about S&B brass for reloading. The picture below shows the S&B group with an unfired round for reference. Bearing in mind that the orange circle is about the size of a kill zone on a deer, this is very reasonable accuracy. If these groups were zeroed in, every shot would be a clean kill.

S&B 2.4 MOA group with unfired 6.5x55 round for comparison.
S&B 2.4 MOA group with unfired 6.5×55 round for comparison.

The negatives with PPU

Well, no one on the range is going to look at your ammo tin on the range and think your other car is a Porsche. But, if you don’t mind that, there’s not much to gripe about with Prvi Partizan. So far I have only shot .303, 7.62×39 and 6.5×55 in PPU and each has performed better than I would expect budget ammo to. I also find it to be quite clean, generally speaking.

However, if you’re wanting superb accuracy without hand loading your own ammo, this may not be the ammo for you. I would suggest trying it – your rifle may love it – but you may be better off paying one and a half or two times the price to get match-grade ammo.

0.64 MOA group shot off a bi-pod with PPU brass, Federal Match primers, 142 gr SMK HPBT projectiles and 34.7 grains of AR 2208.
0.64 MOA group shot off a bi-pod with PPU brass, Federal Match primers, 142 gr SMK HPBT projectiles and 34.7 grains of AR 2208.

There may also be variations in weight of brass and even wall thickness or hardness. This is pure, untested speculation. The only reason I say this could be possible is that the low price indicates that the machinery that produces this brass may not be as thoroughly regulated or maintained as those operated by Hornady or Lapua. The staff may not be as well compensated. But who knows?

What you may wish to do is individually weigh up the clean and empty brass out of a box or two, and see what the variation is between cases. Some spread is to be expected, but too much could have an effect on reloading. You could also see how much water each case holds to determine case-wall thickness and internal capacity. Anyway, I’ve been managing to get smaller than 1 MOA groups out of this brass, so I’m not complaining.

Overall, I think it is well worth the purchase. The accuracy is good enough for hunting ammo if you get the soft point variety, and there’s certainly a place for it in the safe if you just want plinking ammunition or a source of cheap brass.