This is a professional build by Rainier Arms.
KAC SR-15 upper receiver (very low round count from a KAC SR-15 I bought new in 2007)
Ranier Arms 14.5 Ultra Match barrel (45 rounds fired all 77gr OTM) mid length gas system
Rainier Arms gas block
Young Manufacturing National Match M16 BCG
BCM Gunfighter charging handle
KAC front and rear micro BUIS brand new
KAC URX 3.1 rail brand new w/ rail panel kit
AAC Breakout 1.0 permanently pinned and welded
Spare BCM bolt (brand new)
Dime size ragged hole at 100 yards all day long....
Lower, optic, surefire, mag etc not included. This is for the complete upper alone.