Running a 10.5” AR pistol means dealing with velocity loss, which can weaken the performance of standard 5.56 rounds like M193, M855, and 77-grain HPBT. These rounds rely on high speeds to fragment or expand properly—something that shorter barrels just don’t provide. The HOP Munitions 62-Grain REX is purpose-built for short barrels, ensuring reliable expansion, […]
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