Like this one?Cpt,
I'd go with 12" barrel, I was told any less and you might have to tinker with gas system. FCG holes need relocating and you have to add provisions for pistol grip, it's a bit of work, well worth it. Everyone's going with the Galil look, what about an AMD-12 with a 6" long/perm-attached/"door breacher" brake? A true "flash-enhancer" for those after dark sessions.