Heckler & Koch MR223A3 Stripped Semi-Auto Lower Receiver

German Factory Heckler & Koch MR223A3 stripped semi-auto lower receiver with fully ambidextrous controls. Compatible with mil-spec AR15/M4/M5/M16 upper receivers. Manufactured to truly meet and exceed all Mil Spec standards.

Serial list for 2nd and final batch, arriving end of July

For customers who ordered serialized upper receivers in the past, write your serial in the order comments to request a specific serial number lower, we can not guarantee any requests.

This item is a serialized part, considered a firearm and requires transfer through a FFL

NOTE: This product is a firearm receiver and is not classified as a rifle or pistol and can be built as desired.