Videos tagged with Proprietary Receivers

The CMMG Mk47 'Mutant' is a hybrid firearm designed to integrate the 7.62x39mm cartridge into an AR-15-style platform. It addresses common reliability issues by utilizing a beefed-up bolt based on a .308 design and a modified firing pin mechanism for reliable primer ignition with difficult Russian primers. The rifle accepts AK magazines, and its receiver set is proprietary to accommodate these and the larger bolt carrier group. While offering AR-like ergonomics and controls, it notably lacks a last-round bolt hold-open feature, a common trait of AK magazine-fed systems.

This technical review of the Rock River Arms LAR-47 rifle, chambered in 7.62x39mm, highlights its design to reliably use AK-type magazines. The presenter, an experienced firearms instructor, details the proprietary receivers, chrome-lined barrel, and bolt carrier group, while also discussing the historical challenges of adapting AR-15 platforms to this caliber, particularly concerning magazine feeding and primer sensitivity.