at work we carry the benelli m1-90 entry gun and an ar15-dissipator. i also like my mp5-40. all are decked out with night sites, taclites, 3pt slings, etc. i clear houses and business buildings all the time. i only use my handgun because it is handy, by being with me all the time. given the opportunity i would opt for a shoulder weapon. i don't find any of our shoulder weapons confining. a lot of this comes from good tactics of how to employ these weapon systems in hallways, rooms, stairwells, etc. if i have specific knowledge of what i'm going into i would choose the weapons specific as to what the circumstances are. i do prefer the carbine over the shotgun, but would opt for the shotgun in specific situations. what i like about the carbine is that it is short, light,
easy to hit with, i only have to account for one projectile leaving the barrel at a time,
the .223 will penetrate soft body armor, and usually penetrates less that most handgun and shotgun loadings.
just my $.02 worth
sully
http://defensive.edge.home.att.net