BCM Buffer System : Tube, Spring, Endplate, Detent

This guide details the installation of an AT3 Tactical Pro-Builder AR-15 Lower Parts Kit, a comprehensive solution for firearm builds. The video emphasizes the kit's completeness, including essential components like the bolt catch, safety selector, pins, and magazine release. It also highlights customization options with nine available colors. The instruction is presented by a knowledgeable brand representative, offering high authority for DIY firearm assembly.

This video demonstrates the use of the Brownells AR-15 Buffer Tube Lower Receiver Fixture for simplifying buffer tube installation. The fixture securely holds the lower receiver via the grip screw and provides an adjustable, self-aligning support for the buffer tube, ensuring vertical alignment during tightening. This tool also offers additional benefits for staking the castle nut and can be used for other receiver tasks like installing pins and the grip.

This video details a gunsmithing fix for Ruger AR-556 rifles experiencing bolt carrier key clearance issues. The instructor demonstrates how to modify the receiver extension (buffer tube) by filing a notch and smoothing the face to allow the buffer retainer to function correctly while gaining an extra rotation. This modification increases the critical gap between the bolt carrier key and the lower receiver, preventing potential damage.

This guide details a comprehensive physical inspection of a LaRue Tactical AR-15 parts kit, led by an expert armorer from School of the American Rifle. It covers meticulous checks of all components, including trigger pull weight, barrel condition via borescope, and critical thread gauging on the receiver extension. The assessment highlights the high quality of LaRue parts while identifying specific areas, like buffer tube threads, that may require attention or replacement.

This guide details the reassembly process for the HK MR223 rifle, demonstrating expert handling and safe practices. It covers the step-by-step assembly of the bolt carrier group, upper and lower receiver connection, and essential function checks. The video also shows proper magazine loading with a Magpul PMAG Gen M3 and chambering a round, highlighting the rifle's functionality at an outdoor range.

This guide outlines modifications for the BRN-4 platform, focusing on building a reliable 14.5-inch general-purpose rifle. It suggests using a Geissele rail and replacing an upper receiver experiencing issues. The process involves installing a 14.5-inch chrome-lined barrel with a 10-inch handguard, emphasizing practicality over excessive handguard length. Instruction comes from an experienced firearms instructor.

This guide details the installation of a Trijicon RCR red dot sight on a Glock 17 MOS pistol, emphasizing safety and precise torque specifications. The instruction, delivered with high authority, covers firearm clearing, slide disassembly, optic mounting with Loctite, and proper screw torquing using a Trijicon torque card. It highlights the importance of using the correct adapter plate for MOS systems and achieving the specified 13 inch-pounds of torque for secure mounting.

This guide details the expert installation of a Leupold DeltaPoint Pro red dot sight on a Glock 17 MOS pistol. It emphasizes critical steps like safety checks, proper use of thread locker, and precise torque specifications (13 inch-lbs for adapter plate, 25 inch-lbs for optic) using specific Torx bits. The instruction is delivered with an expert tone, highlighting the importance of following detailed procedures for a reliable optic mount.

This guide details the technique for ghost loading a Beretta 1301 Tactical (Mod 1 or Mod 2) using the Pro Lifter, achieving a 7+2 capacity for a total of 9 rounds. The process involves specific manipulation of the charging handle and lifter mechanism to securely seat an additional round. This advanced loading technique is demonstrated by Gear And Guns, highlighting its utility in combat or tactical scenarios.

This guide, presented with high authority by a firearms instructor, details how to use a laser bore sighter for initial optic zeroing. It emphasizes safety by requiring the firearm to be unloaded before use and provides clear steps for aligning the optic with the laser on a target at various distances. The process helps achieve a close zero before live fire at the range.