Just want to report that M&P15-22 safety can be replaced with M16 FCG selector.

Although the M16 fire selector (left) is a wee bit shorter


It fit perfectly but leave a very small recess on the otherside.


Although a bit stiff to rotate due the depth of indent pin engagement, the M16 selector function OK and the feel is very positive.

All in all a very worth while $5 item mod.