Radial Delayed Blowback Compatibility

The Desert Tech Quattro-15 lower receiver is designed to accept proprietary 53-round quad-stack magazines, offering a significant capacity increase over standard 30-round magazines. It is compatible with any traditional AR-15 upper receiver. The Quattro-15 magazines are notably shorter than other high-capacity options like the Surefire 60-round magazine and fit standard double magazine pouches, enhancing loadout flexibility.

This entry provides a comprehensive overview of the Palmetto State Armory (PSA) AXR SSP, as presented by a PSA representative at SHOT Show 2026. Key features include its Short Stroke Piston system, modular design with a monolithic rail and user-changeable barrels, ambidextrous controls, and the new E4 bolt system. The AXR SSP is designed for modularity, suppressor optimization, and compatibility with standard AR-15 components, with plans for future caliber expansion.

Marine X, a USMC veteran with eight months of real-world testing, provides an analytical review of the Eberlestock Transport 21 and 18 bags. He highlights the Transport 21's modularity, CCW compartment, and weapon retention, comparing it favorably to the Vertx Ready Pack X for its extensive loop lining and stand-alone capability, despite a slightly higher price point. The review covers external and internal storage, strap ergonomics, and specific accessory compatibility.

This guide details the process of testing the compatibility of a Rare Breed FRT-15 trigger with a Brownells BRN-4 rifle. The video demonstrates a successful integration, allowing for rapid fire with consistent cycling and trigger reset. The Regular Guy Training host confirms the internet rumors were accurate, showcasing the firearm's performance on an outdoor range.

This CMMG Q&A addresses common questions about their Radial Delayed Blowback (RDB) operating system, covering topics like buffer weights for .45 ACP builds, cam pin differences, compatibility with traditional blowback systems, and available barrel lengths for 9mm RDB uppers. It also touches on magazine fitment for Glock drums and the use of the action tuning kit for suppressed or varied load situations.

This video showcases the BLK LBL aluminum handguard as a premium upgrade for bullpup rifles, particularly the Springfield Hellion. It details the integrated bipod's features, including its 40-degree cant, carbon fiber legs, and tool-less installation. The free-float design is emphasized for its performance benefits. The handguard is noted for its broad compatibility with platforms like the Tavor, AR-15, and Tikka T3x.

This video demonstrates the correct 'rock and lock' technique for inserting AK-47 pattern magazines into the CMMG Mk47 rifle. It highlights a common user error of 'mag-locking' by attempting AR-15 style straight insertion, which leads to malfunctions. The instruction emphasizes that mastering this AK manual of arms is crucial for reliable operation of the Mk47 platform.

This guide details the installation and function of the CMMG P3 (Personal Position Preset) Screw System. The P3 screw, found in the Zeroed grip's storage compartment, installs into the Fastback receiver extension. It allows users to set a predetermined stop position for adjustable stocks or braces like the RipStock and RipBrace, enhancing consistent shouldering. The guide includes specific tool requirements and adjustment methods for both the RipStock and RipBrace.

This guide details the installation and basic usage of essential AR-15 accessories, including slings, charging handles, handstops, triggers, flashlights, and optics, as presented by Mike from CMMG. It emphasizes proper fitment and function checks, while reinforcing that proper training is the most critical element for any firearm owner.

This guide details the installation of the CMMG .22LR Conversion Kit into a standard AR-15 platform. The process involves removing the existing bolt carrier group and inserting the conversion unit. The video emphasizes the cost-effectiveness of .22LR ammunition for training and introduces new shooters to the AR platform with reduced recoil. It also highlights compatibility nuances, particularly for Mk57 platforms.