The 13" MR308 is officially in the catalogue and displayed on the show floor. Both MR308 and MR223 are switching to the slim line hand guard as the standard now.
The 11" MR223 - both MR308 and MR223 have cold hammer forged chrome lined barrels.
The new hand guard is longer than the old railed hand guard. The original fold down front sight attached to the gas block is replaced by rail mounted front site.
Rear sling loop is standard now
The HKey mounting slots appear to need thicker handguard wall than the keypad. Note that full length rails at both 6 and 12.
Brown 16.5" with S&B 1-8 PM2 shortdot