Hey, I was going to order a new pre-ban 16" upper from bushmaster and had a couple of questions about bayonet attachment. First, can I have the standard gas block replaced with one of those 4 way rails and still find a way to attach a boyonet (it would be nice if I could attach the std. M16 bayonet, but any other model I'm willing to consider). Or do I need to get a standard gas block with a bayonet lug to mount a bayonet?
Also, if there is a way to attach a bayonet to a four way rail without the bayonet lug, would that be a legal way to attach a bayonet to a post ban gun, since the ban outlaws the "bayonet lug" not the bayonet?
Lastly, if the barrel is 16" instead of the standard 14.5" on the military carbine, will there be some problem fitting the bayonet on the rifle since the 16" uppers utilize standard (14.5") short handguards?
Thanks for any help.