the real solution is to just have enough disposable income and get both so you can have variety
I want a benelli M4 to partner with my M4(A1 block 1 clone) and then I could make them kiss (but I'm too poor for that unfortunately)
there is novelty in having an M4 rifle and an M4 shotgun. if only there were a pistol named M4 as well.
actually, maybe the M4A1's barrel would fit inside of the M4's barrel. that would be kinda kinky. I don't really feel like getting the calipers out to measure it nor do I feel like looking it up though to be desu.