The HK MR223 was first introduced in Germany last year, well rumor has it that it will finally be released in the United States after the SHOT show. A few ATF issues are cited as the reason for the importation delay. What we do know however, is that the US spec HK MR223 will not feature an offset rear take down that is found on the European spec models. So what does this mean? Users in the US will be able to use HK416 uppers with any Mil-Spec lower receiver.
