Like the title says, this is kind of a dumb question but I`m hoping someone can shed some light. I`m looking into getting a bayonet for my AR, specifically an OKC3S or an M7, depending on what mood I`m in. Thing is, my AR is a 16-inch with carbine gas. It seems to me that the only real hitch would be that the blade itself would sit further back than it would on an 18 or 20-inch. Any thoughts? Can someone please help?