Pin and weld, do it yourself

[UrbanWolf]

How to do a pin & weld while still make it possible to take off the muzzle brake without screwing up the threads on the barrel?

*Edit, title should be "Pin and weld, do it yourself". Spelling is not easy today.[gohome]

[cofi]

How to do a pin & weld while still make it possible to take off the muzzle brake without screwing up the threads on the barrel?

*Edit, title should be "Pin and weld, do it yourself". Spelling is not easy today.[gohome]you can't legally pin and weld a muzzle brake and have it removable at the same time

You drill a hole through the brake into the barrel put a pin in there and weld over the top

If you ever need to remove it you need to bring it to someone like Bert who can drill that pin out

[SAnd]

You can also use 1100 degree silver solder to 'permanently' attach a muzzle device. That method doesn't cut up the threads. You have to be careful to not heat damage the barrel though.

[spleify]

How to do a pin & weld while still make it possible to take off the muzzle brake without screwing up the threads on the barrel?

*Edit, title should be "Pin and weld, do it yourself". Spelling is not easy today.[gohome]

Title fixed

[BPTactical]

The entire impetus behind pinning and welding a muzzle device is to make it a permanent part of the barrel.
Theoretically any attempt to remove the device should destroy the muzzle sufficiently to render the firearm unserviciable. I have unsubstantiated rumblings that the device must withstand 200 ft/lbs of torque without failure to be considered permanent. I am attempting to get a clarification from the Technologies branch on this.
At this time there are 3 methods approved for permanently attaching a device:
1- Blind pin and fusion weld over the pin, using a hardened steel pin.
2- Silver bearing solder with a melting point of no less than 1100F.
3- Fusion weld for no less than 180 degrees of the circumfence of the barrel diameter.

Each have their ups and downs, method one is the easiest to reverse should one decide to change a muzzle device but is also the most difficult to perform correctly, the pin needs to be a press fit, drilled and reamed to the correct depth without going too close to the bore and most folks don't have a TIG available to weld it neatly. It is the least invasive and can be done without refinishing the barrel.

Method two is virtually impossible to undo without ruining the barrel from overheating and drawing the carbon out of the steel. The best method of undoing it is to machine the old device off and pick up the old threads and recut them. Also consider this when soldering, you are putting a tremendous amount of heat into one of the most critical areas of the barrel. Overheat it and you can scale up the bore or I have seen chrome flake due to the heat. Refinishing is mandatory.

Method number three is just gawdaful. It looks like hell and really fouls up the muzzle end of the barrel. When you heat metal to welding heat it expands, now when it cools it contracts. Gee, you think heating one half of the barrel right at the muzzle and allowing it to cool is going to keep the device straight? I have seen a welded brake barrel suffer a strike from it pulling the brake down as it cooled(owner installed the brake). I have also seen flash hiders that showed a visible "droop". Refinishing is mandatory.

[ChunkyMonkey]

^^ This.. I also heard the same thing as Bert. Supposedly during an inspection, an ATF agent, for leverage, slid a pipe over the AR Wrench on the muzzle device -.. and put his full body weight on the wrench/pipe.

[Goodburbon]

^^ This.. I also heard the same thing as Bert. Supposedly during an inspection, an ATF agent, for leverage, slid a pipe over the AR Wrench on the muzzle device -.. and put his full body weight on the wrench/pipe.

Would I be charged with assault for punching someone in the face for trying to hang on my $1200 gun like a g-damn gorilla?


Sent from my iPad using Tapatalk HD

[BPTactical]

^^ This.. I also heard the same thing as Bert. Supposedly during an inspection, an ATF agent, for leverage, slid a pipe over the AR Wrench on the muzzle device -.. and put his full body weight on the wrench/pipe.

And it would fail in court if you had the means to fight it, the above would be an inaccurate method of testing. Depending on the length of pipe and the weight of the agent you could exceed 500 ft/lbs easily. We used to break loose tower bolts for boom lift trucks that were torqued to 450 ft/lbs with a 3' cheater bar.
To give one an idea of a foot/pound, it is the amount of force required to lift one pound one foot. So 200 ft/lbs would be the force required to lift 200 pounds one foot.

Is it something that is enforced? Not sure, chances are if you are getting shaken down to that point you have bigger problems, similar to 922r compliance. To the best of my knowledge when people have been charged for it it has been an ancillary charge to something else.
The main reason I leave a small weld crater in place is so if you are questioned it is obvious the device has been pinned and welded properly.


GoodBourbon, if you are in that situation I don't think an assault charge would be to worry, your probably in custody already.

[UrbanWolf]

Would I be charged with assault for punching someone in the face for trying to hang on my $1200 gun like a g-damn gorilla?


Sent from my iPad using Tapatalk HD

It's only illegal to assault a human, those gorilla aren't.

[UrbanWolf]

And it would fail in court if you had the means to fight it, the above would be an inaccurate method of testing. Depending on the length of pipe and the weight of the agent you could exceed 500 ft/lbs easily. We used to break loose tower bolts for boom lift trucks that were torqued to 450 ft/lbs with a 3' cheater bar.
To give one an idea of a foot/pound, it is the amount of force required to lift one pound one foot. So 200 ft/lbs would be the force required to lift 200 pounds one foot.

Is it something that is enforced? Not sure, chances are if you are getting shaken down to that point you have bigger problems, similar to 922r compliance. To the best of my knowledge when people have been charged for it it has been an ancillary charge to something else.
The main reason I leave a small weld crater in place is so if you are questioned it is obvious the device has been pinned and welded properly.


GoodBourbon, if you are in that situation I don't think an assault charge would be to worry, your probably in custody already.

FPS Russian is in custody right now, not sure what he did with the guns, but he did say something mean to the reps of "Moms demand gun control action".