Videos tagged with Locking Piece

This guide details critical modifications for the PTR K3P, focusing on the importance of the correct locking piece angle for the 12.5-inch barrel to ensure firearm longevity. It also addresses optic compatibility issues, advising on how to prevent malfunctions caused by interference with the ejection port. The information is presented with the analytical and practical tone of an experienced firearms instructor.

This guide details two key modifications for optimizing the Heckler & Koch MP5-K PDW for suppressed shooting, as demonstrated by James Reeves. These include installing an 80-degree locking piece and utilizing the 'Gray' extractor spring for improved reliability and durability under suppressed conditions. The video emphasizes the MP5-K's suitability as a suppressor host due to its roller-delayed blowback system.

This video details the return of the PTR 51P PDW after experiencing significant reliability issues. The primary cause was identified as an incorrect locking piece (70-degree instead of 55-degree) intended for a standard MP5 barrel being used in a .308 caliber firearm. PTR Industries replaced the serialized upper receiver and provided a new hammer, returning the firearm to factory configuration. Chronograph testing showed the 8-inch barrel .308 achieved around 1800 FPS with 145-grain Wolf ammunition, a reasonable but not exceptional velocity for the caliber and barrel length. The reviewer notes the firearm is now functioning flawlessly but plans to sell it due to its impracticality, suggesting a PTR-9KT or a full-size .308 rifle as more practical alternatives.

This guide breaks down the complex roller delayed blowback operating system, originating from Mauser's WWII-era innovations. It details the mechanical interaction of rollers, locking pieces, and bolt carriers to achieve delayed extraction, highlighting advantages like simplicity and accuracy, and disadvantages such as suppressor incompatibility. Expert analysis from Ian McCollum provides deep insight into this unique firearm mechanism.

This video introduces the LMT MRP (Monolithic Rail Platform) AR-15 upper receiver, now featuring M-LOK. It highlights the monolithic construction for rigidity and the new slimmer, lighter design. A key feature is the quick-detach barrel system, allowing for barrel swaps between calibers and configurations like 300 Blackout and 5.56 NATO. The uppers ship with 5.56 barrels and include proprietary gas blocks, gas tubes, locking pieces, and flash hiders.

This guide details the proper lubrication points for a Steyr Aug rifle, emphasizing the importance of avoiding over-lubrication to prevent debris accumulation. Key areas include the gas piston system, bolt guide rods, carrier, and locking piece. It also advises checking general metal surfaces for wear and applying oil for smooth operation.

This video provides a detailed, step-by-step guide for reassembling the Steyr Aug A3 rifle. It covers the reassembly of the bolt carrier group, gas system, trigger mechanism, and the final attachment of the barrel to the receiver. The guide emphasizes ensuring components click into place and concludes with a crucial safety check.