Join Date: Feb 2009
Location: Gloucester, Virginia
Serial number is not a reliable way to determine the receiver type, nor is the SB stamp on the barrel. You must pull the rear stock off and look at the receiver. Solid rear walls are SB1, skeletonized rear walls are SB2.
I reload and shoot 348 Win, 358 Win, 6.5 Grendel, 30-06 Springfield, 300 BLK, 44 Mag, 357 Maximum, 9mm, 45 ACP, 45 Colt, 225 Win and 35 Rem