Assertion: shotgun's barrel | /r/HasProperty | blowback muzzle
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Source sentences:
text: 9 mm Length 30.0 in Weight 8 lb 15 oz Barrel 8.0 in long, 4 grooves, right hand twist Feed system 30-round detachable box magazine System of operation Blowback Muzzle velocity 900 feet/sec Rate of fire