Permanently attaching a flash supressor

[jbush]

My brother, back east in the sticks, thinks he can bid on some AR 15s or parts of AR15s that a local LE agency or someone is getting rid of. They have 14.5 inch barrels, which means they would need to have permanently attached flash suppressors to make them 16 inches. How hard or expensive is this to do and what constitutes permanently attached. Drilled and pinned, welded?????? What.

I don't want him to bid on something that can't be used or is expensive to modify. If he can get them for a good price, I was going to have him bid on one for me. These have been used by LE for training so I bet they have alot of rounds through them. He hasn't had a chance to go look at them. I might just have him send me an upper to avoid the transfer costs. Thanks

[SJgunguy24]

Accepted ATF methods are drill through the muzzle device and into the barrel slightly, drop a pin and weld over the pin. Another is using silver solder with a melting point above 1100degF.

[Sicarius]

It is fairly easy. What you do is get the flash hider on and drill through the hider and a little bit into the barrel. Cut a piece of rod, drop it in and put a spot weld on it. Grind the spot weld a little bit and refinish. The rod keeps the flash hider from being turned off. What some people do is predrill the flash hider, get it lined up then blip the barrel just to make sure they don't go too far into the barrel.
Kevin

[SJgunguy24]

Fotgot to add, use a square end mill to give the pin a good shoulder to lock into. If not it will be able to spin off with a wrench and minimal effort.

[wash]

If he as a hammer, punch, upper receiver block and barrel wrench, he can remove the barrels from the uppers which should remove the constructive possession element.

If he owns an AR pistol lower or virgin lower, that could eliminate the constructive possession issue also.

Without constructive possession, he could have the barrels pinned at his leisure.