Mosin barrel extension?

[Datamancer]

Hello, I found this online and was wondering...is this safe at all?


http://www.gswagner.com/mosin-nagant/brake/mnbrake.html

With the zillions of muzzle brakes, suppressors, silencers, compensators, etc, that are available as aftermarket parts for rifles and shotguns, I figured a small, 1.5" barrel extension probably wouldn't be TOO dangerous, but there's quite a large mating area between the barrel and the metal tip so I wondered about metal expansion and the potential for cracking if the barrel and extension want to expand at different rates. I was also curious as to how the drilled extension portion would effect the physics of the gas expansion at the barrel tip and if the standard, unhardened steel portion could actually withstand the pressures of sustained use.

Thanks,
-Doc

[croc4]

done it on two rifles

So yeah I would say its safe....................., the extension doesn't hold any pressure like the barrel, I've gone through a number of rounds without any issue, But I put holes right at the end of the real barrel.

At the end of the day, it makes the barrel "look" better more than anything else, I don't see any difference in firing than any other M38/M44

Here is "croc4's" version

http://www.postimage.org/image.php?v=aV1EPsGA

Croc4

[Datamancer]

Hey Croc, thanks for the response. Ok, cool. I just wanted to make sure before I tried it myself. I wasn't certain how much force was generated by that initial "pop" as the gas first explodes outward from the barrel crown and if the regular mild steel could handle it over say, 100 rounds or so.

Did you use any kind of special metal stock with yours or just plain old steel?

Would this still be legal to fire at a CA range, or would it now be a "modified firearm" or whatever?

-~Doc~-

[mycrstuff]

Wouldn't it be easier to drill the ports in the original barrel and then counter bore it. The problem with adding anything on to a M-44 barrel is that the end is tapered. Nothing is going to stay on it.

[croc4]

the pressures given the way things are set up are not an issue IMO, the way it is shown. The gasses expand into an area the size of the external barrel, this area then has vent holes so no real pressure is being "held". I just used standard plumbing stock as mentioned.
The mosin nagant is not what I would consider a high pressure round.

Since this is a bolt action with a fixed mag, I don't see any laws that would be violated, by doing this, it doesn't change the noise signature (still loud as hell). Again, it does more for looks than anything. I picked up some M44 barrels and receivers for $14 each a few years back, the barrels are excellent, but the trigger hole was bored to 1/4" ;-/, so they needed a little more work.

If your looking to get this a tack driver, I would recommend changing the angle of the sear, on the mosins, when you pull the trigger, the sear retracts downward as well as rearward, the rearward movement works against the firing pin spring making the pull harder, but changing this angle you can get it to drop without compressing the spring, it is one of the things that helps the trigger. I think I have mine shooting at 5/8" at 50yrds with 5 rnds (it might be closer to 1/2"), but I wanna play it safe since I don't have "proof" at my finger tips right now.
Tennesee gun parts went down some time back and I have a few more barrels assys sitting unfinished do to lack of parts........Grrr!!!

if you shoot me a PM, I can send targets that show what mine is printing.

Croc4

[Datamancer]

Thanks for the input, everyone. Does the 91/30 have that step in the barrel too, or is it just on the M44 as part of the integrated bayonet? I'm thinking my M44 might just be too cool to mod. I love the chunky, WW2 styling of the M44, but the 91/30 is a little too skinny, spindly and Civil-War-looking for my tastes.

-~D~-

[croc4]

Just the M44

The M38 has a small step for the front site, I think it is in the area of 5/8" or so long, I believe the 91/30 is the same(been a while since I have pulled them from the safe)

If your going to mod a 91/30, then the extension would not be needed (IMO), just cut the barrel down and re-crown (done that myself too ;-) ), and they also make good shooters.

The extension is good for covering the step where the bayo sits, other than that it really has no other function than looks.

Croc4

[Datamancer]

Wouldn't it be easier to drill the ports in the original barrel and then counter bore it. The problem with adding anything on to a M-44 barrel is that the end is tapered. Nothing is going to stay on it.

That's a good point. I had forgotten that the end is slightly tapered. Is the taper mild enough that you are able to just fill the front gap with solder, or do you think I'd have to file or machine a taper to the inside of the barrel extension as well?

-~D~-