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The RC-QD is a front QD point that also bridges the MMS sling-loop cut and shields the hand from retainer heat. The HRD-EXT is a reversible handstop with three M-LOK slots; it fits our MMS handguards, and the product page says it fits any M-LOK handguard. The HG-RM is for lasers, because it gives a rigid base by removing free-float. The product page notes that removing free-float may affect long-range accuracy. Parts in this post HG-RM Rigid Mount RC-QD Sling Mount HRD Extended Hand Retention D …