Key Tags barrel, bull, contender, contour-new, g1g2, ssk50, supermag. SCOPE BASE Silver 6 Hole Base Included. TC Contender New 12 Barrel SS Caliber. PLATFORM SSK / G1/G2 Contender SSK50. 22 LR match Chamber w/ front site BSA 2×20 mm pistol scope w/Base & See thru Rings.