Videos tagged with Upper Receiver Kits

The H&K MR556 A4 represents the closest civilian-accessible version of the military's 416 rifle. Key updates include a significant weight reduction from the original MR556, a slimmer handguard, a new barrel profile, and true ambidextrous controls. It features a two-stage adjustable gas block for suppressed and unsuppressed use, and incorporates components like the over-the-beach bolt carrier and buffer, and an elongated castle nut, all derived from the 416 platform. HK USA is also offering multiple barrel lengths for upper receiver kits, allowing users to convert standard mil-spec lower receivers.