posted on Feb, 4 2009 @ 11:28 PM
It's really just like any other piston upper available for the AR15/M4. HK is releasing civilian versions called the MR223 and MR308 which are
chambered for 223/5.56 and 308/7.62x51.
www.hkpro.com...
Should be interesting with the HK offering, FN SCAR 16s or whatever it's called and the bigger 7.62, and the Bushmaster ACR aka Magpul Massada if it
ever makes it
www.bushmaster-acr.com...