I've got an M4s mounted on flush on the 556 and it's not a problem at all.
Can't help on the covers, though.
Can't help on the covers, though.
...IMO there is the potential for one...i would suggest going with the Comp M4 instead...i have a Comp M4 mounted low without the spacer on one of my 556s and do not have any issues with it...it's a perfect fit !nwodone said:Is there an interference issue with 556 charge handle using the Aimpoint M4S without the spacer?