The Mossberg 930 JM Pro is a competition-oriented semi-automatic shotgun developed in collaboration with 3-Gun champion Jerry Miculek. The 24-inch ported barrel, extended magazine tube, and oversized controls are optimized for 3-Gun competition speed. Type: Shotgun Action: Semi-Automatic Caliber: 12 Gauge Capacity: 9 Year introduced: 2014, USA Weight: 7.6 oz Overall length: 44.5" Status: Active Intended use: 3-Gun Competition, Tactical