I have had many black rifles...by way of a black fiber stock, and NOT by way of an AR.
I guess I am a rare bird, since I am not a fan of the current "Mattel" style rifles. Nothing wrong with the AR,
but for me it doesn't seem to answer for what I like in a gun.
I have tried the black rifles.. the Butt plate doesn't fit properly, there is usually a long magazine hanging down in
the way.
The forestock doesn't lend itself to a comfortable grip, and there seem to be numerous 'snag points' sticking out
all over the thing..not so good when hunting in thick brush.
Of course, that black rifle has few peers as a combat rifle, since it is so versatile, and a base for other military
systems, but I don't see that transferring to civilian usage.
Having used them, I am well aware of one stark advantage other than larger caliber, that the M1 or M14 has over the AR...and that is their suitability to mount a bayonet. Just can't picture an AR as a great bayonet host...
Surely some others must think the same way.. Below; one of my black rifles A Savage 93F in 22 mag.