No contest the gun I HATE to shoot is the M16.
Two of the rifles I was issued were Colt's I saw no difference between them and the Harrington Righard's I was issued at Ft. Carson.
I had 2 A-1s ( full auto) and 3 A-2s ( three round burst)
Never had any reliability issues W/ any of them. Obviously the price was right and the Ammunition was free as well.
The problem was every time I got to shoot one it meant I had to lose sleep ( & maybe my day off) get up in the middle of the night, ride halfway across Germany ( or Fort Lewis, or Fort Carson or Fort Sill) usually in a snow storm or a rainstorm. get to the range at 4 am and wait till 9 for range control to get done W/ PT and open the range ( did I mention the rain and snow) Eat a nasty MRE for breakfast , a NASTIER MRE for lunch and suck it up for dinner. spend at least 12 hours on the range ( not counting drive time) to shoot 49 rounds usually in a foxhole full of mud & the ocassional rattlesnake and climb back in the Duece & a half ( did I mention the rain & snow ) to arrive at the barrack ( usually right after taps) just in time to spend 2 hours waiting for the arms room to open up ( for what that was worth ) and the rest of the night scrubbing that GD M-16. If I never shoot one again it'll be too soon.