NEW MK46S SEMI AUTO 5.56X45 BELT FED RECEIVER ASSEMBLY, READY FOR YOUR BUILD. THIS IS A CLOSED BOLT SEMI AUTO RECEIVER WITH EJECTION PORT COVER, GAS TUBE RETAINING SPRING-CLIP, TAKE DOWN PINS AND BARREL LEVER INCLUDED.

07FFL-SOT MANUFACTURERS CAN ORDER ONE OF OUR AUTO CONVERSION KITS TO FIT THIS SEMI GUN. ALL NFA LAWS APPLY.