Originally Posted by
theoak
I have two ARs, so I'm thinking of SBR'ing one and buying an LWRC M6A3 12.7" 6.8mm SPC w/ a AAC Blackout Adaptor (so I can add a suppressor later).
I figure the velocity loss wouldn't affect the 6.8mm as much, and a gas piston system is more beneficial on a carbine length system.
The only things I don't like about SBR'ing are the registration, the engraving, and the loss of velocity.
One other question about suppressors: The "tax stamp" is for the suppressor and not the rifle? Does that mean you can use a suppressor on different rifles, or do you have to register it on a particular rifle?