The Outdoor Connection MagBoltMossberg 500/8812Gauge Black. This Outdoor Connection MAG Bolt Mossberg 500 12Gauge-20Gauge is machined from cold-rolled steel and quickly replaces the original shotgun magazine tube cap. Outdoor Connection MAG Bolt Mossberg 500 12Gauge/20Gauge Steel Magazine Takedown Bolts feature a swivel base that rotates 360 degrees and accepts any standard U.S. detachable swivel. Specifications for The Outdoor Connection MagBoltMossberg 500/8812Gauge: Manufacturer: The Outdoor Connection Color: Black Fabric/Material: Steel Gun Model: Mossberg Maverick 88 20 Gauge Mossberg Model 500 20 Gauge Mossberg Maverick 88 12 Gauge Mossberg Model 500 12 Gauge Features of Outdoor Connection MAG Bolt Mossberg 500 12Gauge-20Gauge Magazine Takedown Bolt: Machined From Cold Rolled Steel Includes 3/4" Wood Screw Swivel Base Distinctive knurl pattern Blue/black oxide satin finish will blend well with any firearm Package Contents: The Outdoor Connection MagBoltMossberg 500/8812Gauge The Outdoor Connection TSC-79544: MagBoltMossberg 500/8812Gauge Black