CIMG in Fulton MO Posted February 19, 2020 Report Share Posted February 19, 2020 (edited) HK MR556 low round count upper that I had the barrel tab professionally machined off so a full auto 416 bolt carrier will work. Once that was done I swapped the carrier for a early 416 bolt carrier. Has a Troy Ind. Carbon fiber handguard. This really takes away the front ended weight. $1550 obo Prefer paypal f&f or you pay the upcharge or USPMO. https://imgur.com/a/ud41kRp Edited February 25, 2020 by CIMG in Fulton MO Quote Link to comment Share on other sites More sharing options...
Tall Pine Posted February 19, 2020 Report Share Posted February 19, 2020 (edited) What is the barrel length, and does the bottom of the upper receiver have the auto sear relief cuts? Do you have the original handguard? Thx Edited February 19, 2020 by Tall Pine Quote Link to comment Share on other sites More sharing options...
CIMG in Fulton MO Posted February 19, 2020 Author Report Share Posted February 19, 2020 (edited) 16" standard barrel, receiver has not neen messed with. Edited February 25, 2020 by CIMG in Fulton MO Quote Link to comment Share on other sites More sharing options...
Tall Pine Posted February 19, 2020 Report Share Posted February 19, 2020 How about sear relief cuts? I dont know if HK included them on the MR556 or not. If you post a pick of the underside of the upper receiver that will tell the tale. Without the relief, the upper wont close down over a M16 registered receiver auto sear. Thx Quote Link to comment Share on other sites More sharing options...
CIMG in Fulton MO Posted February 19, 2020 Author Report Share Posted February 19, 2020 No sear cut, my plan was rmto use a dias. They can be added easily. Quote Link to comment Share on other sites More sharing options...
CIMG in Fulton MO Posted February 25, 2020 Author Report Share Posted February 25, 2020 (edited) Sale pending Edited February 29, 2020 by CIMG in Fulton MO Quote Link to comment Share on other sites More sharing options...
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