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welded and riveted suppressor legally lengthen barrel?

Posted: Wed Jan 16, 2019 6:54 pm
by fun2drv
I have a 9mm Palmetto armory ar15. I've ordered a 10.5" barrel for it that I'm going to permanently attach my 6 1/2" form 1 suppressor to. The suppress is all Titanium. I can easily tack weld a barrel nut to make the threaded cap permanent. But now I need to make the tube permanently attached to the threaded cap. I was wondering if riveting it would satisfy the requirements since titanium is such a pain to braze or weld. Any suggestions or opinions?

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Wed Jan 16, 2019 7:07 pm
by fishman
No that doesn't meet the requirement.

I recommend not welding silencers onto barrels. I wish I never had.

On a more helpfull note. You can pin the tube to the endcap, then weld over the pin. Thats what I did. No titanium welding required.

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Wed Jan 16, 2019 7:23 pm
by fun2drv
Both of the end caps, tube and baffles are titanium. I could pin, but since everything is titanium, I can't weld over the pin and have the weld hold to the titanium. I may have to find a shop that can braze titanium for me. Once I do, can I leave the far end cap removable to be able to remove and clean the baffle stack? The tube and threaded cap would be permanently attached. Thanks for the quick reply!

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Wed Jan 16, 2019 7:48 pm
by fishman
Just find an FFL that can weld titanium. Its not rocket science. Have them weld the tube to the cap, and pin the cap to the barrel.

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Sat Jan 26, 2019 2:34 pm
by ECCO Machine
fun2drv wrote: I was wondering if riveting it would satisfy the requirements since titanium is such a pain to braze or weld. Any suggestions or opinions?
Ti is not difficult to weld at all. The challenge is maintaining an inert atmosphere so as not to oxidize the metal in the HAZ. But for TIG welding a pin, you HAZ is tiny, not enough to worry about IMO.

Don't try to braze, though. Too much HAZ.

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Sun Jan 27, 2019 9:28 pm
by zevdogs
Dont weld something you might want to change
This is what i did to my rifle in order to suppress and not SBR

https://youtu.be/UKpfdf3bcRU

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Sat Mar 02, 2019 12:12 am
by crazyelece
High temp silver soldier would work, but unless SBRs are illegal in your state it really isn't worth it.

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Sat Mar 02, 2019 1:29 pm
by fishman
crazyelece wrote:High temp silver soldier would work, but unless SBRs are illegal in your state it really isn't worth it.
Brazing titanium will weaken it unless you did it in the absence of oxygen somehow. You couldn't use a torch or any flame

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Sat Mar 02, 2019 7:23 pm
by T-Rex
fishman wrote:Brazing titanium will weaken it unless you did it in the absence of oxygen somehow. You couldn't use a torch or any flame
The flux used in the brazing process will protect the joint from oxidation. Just don't get the metal anywhere near bright cherry or the flux will start to burn off.

Personally, I'd rather pin/weld than silver solder. Much easier when it comes to removal time.

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Sun Mar 24, 2019 9:23 pm
by Aaron
Buy a long handguard and pin that. I've seen 10/22s with short barrels with affixed suppressor shrouds that don't require stamps because the shroud is permanently affixed and contributes to the OAL

Re: welded and riveted suppressor legally lengthen barrel?

Posted: Mon Jun 03, 2019 4:50 pm
by fishman
Depending on the handguard, that can add a lot of weight. 17" handguards aren't usually designed for lightweight builds. Maybe a custom titanium handguard?