An adjustable bolt carrier vent for suppressed and non suppressed

[montana]

http://www.thefirearmblog.com/blog/2015/...s-gemtech/

We now have adjustable gas blocks, tubes, keys and bolt carriers. Lot's of choices!

[Drift]

Link broken.

[LRRPF52]

There's another manufacturer with an adjustable gas bolt carrier as well. I'll have to find it. There are also at least 2 adjustable gas keys. Sun Devil and Rubber City Armory.

[burkew23]

2a-Armament makes one as well, looks very similar to Gemtech's but you can adjust the carrier without having to disassemble which would be nice. It's also a lightweight design.

http://www.ar15.com/forums/t_2_493/25901...rrier.html