It's everything I have to resist ordering a 21" Comp, on a daily basis. I see it as a GP shotgun, and I've been trending to those types of firearms lately while going all "minimalist" on my safe lately. Lack of RDS mounting solutions (good ones) is what's held me back to this point. An available CROM would do it for me.
Looking forward to watching this progress.
Sidebar question, for the general thread.... Is there a generally agreed upon best way to mount a white light on a Comp? The handguard is too thin to mount a pic rail, yes? Is it too crowded with the Blink gas system to use a reinforcement piece underneath to sandwich the handguard?