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This rifle has a "Rifle" length gas tube. The barrel is not threaded with a recessed muzzle crown. Mossberg should be able to answer the barrel diameter at the muzzle at Mossberg CS/product Information Tel: (203) 230-5300 | 8:00am-4:30pm Eastern

Hi Patrick Its not threVded, The Mossberg MMR Hunter chambered in 5.56 NATO is perfect for just about any hunting outing that calls for a light and fast round. Not only is it great at putting meat on your table, but it also puts tiny groups of holes into paper targets like a target rifle too! The Mossberg rifle includes a Stark SE-1 pistol grip with integrated trigger guard, an A2 style fixed stock, an aluminum free float handguard with two sling swivel studs, an optics ready flat top upper receiver and a low profile 5 round magazine. The optics ready flat top receiver is perfect for mounting a high powered scope that allows you to really squeeze the last bit of precision out of this rifle. The 20" heavy profile barrel with a 1:9 twist is perfect for those lighter varmint loads that do a wonderful job of dropping game. Specifications and Features: Mossberg MMR Hunter semi auto rifle 29100 .223 Remington/5.56 NATO 20" Barrel Aluminum free float handguard Flat top upper Fixed A2 Butts

Its not threaded with a Rifle length gas tube

The barrel is not threaded and has a "rifle" length tube The Mossberg MMR Hunter chambered in 5.56 NATO is perfect for just about any hunting outing that calls for a light and fast round. Not only is it great at putting meat on your table, but it also puts tiny groups of holes into paper targets like a target rifle too! The Mossberg rifle includes a Stark SE-1 pistol grip with integrated trigger guard, an A2 style fixed stock, an aluminum free float handguard with two sling swivel studs, an optics ready flat top upper receiver and a low profile 5 round magazine. The optics ready flat top receiver is perfect for mounting a high powered scope that allows you to really squeeze the last bit of precision out of this rifle. The 20" heavy profile barrel with a 1:9 twist is perfect for those lighter varmint loads that do a wonderful job of dropping game. Specifications and Features: Mossberg MMR Hunter semi auto rifle 29100 .223 Remington/5.56 NATO 20" Barrel Aluminum free float handguard Fla