MR556 A4 Upper Receiver
- AR15 Uppers
HECKLER AND KOCH (HK USA) MR556A4 UPPER KIT 5.56MM 16.5″
$2,179.00 Add to cartHECKLER AND KOCH (HK USA) MR556A4 UPPER KIT 5.56MM 16.5″
- AR15 Uppers
HK MR556 A4 COMPLETE UPPER – RECEIVER 5.56 16.5″ BARREL
$2,179.00 Add to cartHK MR556 A4 COMPLETE UPPER – RECEIVER 5.56 16.5″ BARREL
