Fn 20100821 Stripped Lower Receiver for M4 M16 7075 T6 Aluminum Anodized

The FN 20100821 for M4/M16 is a replica stripped lower receiver that carries the lineage of FN's U.S. Military carbines into your build, forged from 7075-T6 aluminum, machined and broached to MIL-SPEC tolerances and finished in durable anodized coating so fit and function match service-grade expectations. You'll notice the authentic FN U.S. Military receiver markings and a fire control housing modified to block select-fire operation, making this semi-auto lower the closest legal reproduction to original DoD contract M4 and M16 receivers, which matters when you're assembling a competition rifle, a range trainer, a patrol-style hunting setup, or a collection of accurate military-pattern firearms. Because these receivers are manufactured to the exacting specification used on government contracts, they drop into mil-spec parts and upper receivers without extra fitting, letting competent armorers and hobbyist builders save time and reduce headspacing or alignment headaches. This item is a firearm part that requires an FFL transfer and carries the California Proposition 65 notice: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.