This is the Next Level Armament NLX 556 charging handle for full size AR15 format receivers (including .22 versions).
Will not fit the M&P 15-22 - please see the special sized NLX 15-22 version (shorter).
A high quality drop in ambidextrous charging handle, giving you one finger cocking right or left side with plenty of scope clearance, even with gloves on.
Manufactured from billet 7075 aluminium the NLX 556 is both durable and simple, having fewer moving parts than other designs.