NEW 12-20 GAUGE SHOTGUN/.51-.75 CALIBER BORE ADAPTER BAK-1220-300   MSRP $19.95 SPECIFICATIONS: COMPATIBLE FIREARMS: 12-20 GAUGE SHOTGUN, .51-.75 CALIBER COMPATIBLE TOOL: LBS-0006-140, PLB-0006-140, LBS-HULK-140 MATERIAL: POLYMER WEIGHT: 0.4oz LENGTH: 3" Additional Videos 12-20 Gauge Shotgun / .51-.75 Caliber Bore Adapter.   BAK-1220-300   The Shotgun Adapter system allows quick and easy sight-in of 12-20 gauge shotguns, slug guns or turkey guns. Now with improved features this adapter allows the sighting-in of rifles from .51 to .75 caliber. The adapter works with all laser bore sighters (except for the .17-.22 caliber bore sight). The adapter is made from Dupont Delrin® for maximum durability and accuracy.