Chambered for the 10 gauge 3.5 inch magnum round, the Roadblocker is a large and heavy shotgun. A semiautomatic shotgun, it features a counter-recoil gas system ("countercoil") to lower the recoil impulse. Intended for use at roadblocks where it would not be carried for long periods of time, the large shot load or slugs fired by the MAG-10 would quickly disable fleeing vehicles. The placement of the gas system at the front of the magazine tube limits the magazine capacity to two rounds (plus one in the chamber).
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