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Hi Robert and welcome. This upc has a 20" barrel with 11/16x24 threads. Mossberg Exclusive RIB is just a limited run model. cheers and stay safe!

Robert, it just means it's limited edition. Yes this has a 20" barrel with 11/16x24 threads. Hope this helps. If interested here's more specs.................. Caliber: .450 Bushmaster, Capacity: 4+1, Barrel length: 20", Barrel style: Button-rifled, threaded 11/16x24, Barrel twist: 1:24", Stock: Synthetic, Length of pull: 13.75", Trigger: Lightning Bolt Action Trigger adjustable 2-7 lbs, Overall length: 42.25", Overall weight: 6.5 lbs.

Robert, no muzzle brake, but threaded 11/16x24. Not sure what RIB means, cannot find that anywhere. . More Info - . The Patriot's button-rifled barrel is free-floated and features 11/16x24 threads for muzzle devices. At 20" long, the barrel is long enough to achieve full velocity from every caliber, but short enough for quick handling in the densest woods. . The Patriot also features a spiral-fluted bolt with new bolt angle and knurl pattern for smooth, comfortable, reliable cycling. And, it comes equipped with the Lightning Bolt Action Trigger, which is user-adjustable from 2 to 7 lbs. And the best part? Despite all these premium features, it's STILL competitively priced. If you want to stretch your hunting dollar as far as it'll go, look no further. . This model features a special Moss Green stock. . Patented Lightning Bolt Action Trigger is user-adjustable from 2 to 7 lbs. Button-rifled barrel with recessed target crown for outstanding accuracy Spiral-fluted bolt with