This review compares a PRI Mk12 Mod0 upper with a BCM reproduction, evaluating accuracy with MK262 and similar 77-grain loads. The BCM upper showed a 4% average accuracy improvement. The Allen Engineering AEM5 suppressor significantly reduced group sizes by 30% with zero point-of-impact shift, demonstrating its effectiveness. A technical flaw in the BCM barrel's suppressor collar was also identified.
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