CZ Bren 2 that started as a 8" 5.56 that was converted to 300 blackout by MOS-TEK. I had this gun converted to get better use of the 8" barrel. It has a Dan Haga rear pic rail adapter, an HB industries handguard, and an HB industries flat faced trigger installed. The trigger reduces the pretravel and eliminates overtravel greatly improving the firing mechanics.