minutemen1776
Member
I've been looking at Rock River 9mm AR carbines lately. I love the AR platform and shoot a lot of 9mm handguns, so I'm thinking this might be a good buy for me. One added draw (I think) would be that such a carbine would be a good candidate for an SBR at some point in the future. I believe these rifles are blowback-operated, as opposed to direct impingement like most other ARs. With this type of system, would there be anything to SBRing it (other than the tax/legal aspect) besides just chopping the barrel and rethreading for the flash suppressor? If I go this route, I would almost certainly start with the 16-inch barrel and carbine handguard. If I like the platform and it's reliable, then I could cut it back to 10 or 10.5 inches once the paperwork is cleared. Mechanically, is there anything more to it than that? Thanks.