From The Bench: LMT MARS 308

This video provides a detailed unboxing and initial look at SLR Rifleworks components for an 8.6 Blackout AR-10 build. The instructor highlights the quality and design of the SLR handguard and barrel nut, comparing its thickness to an alternative. The process of preparing for installation, including the removal of the barrel nut and the anticipation of assembling the upper receiver, is covered. The instructor expresses high satisfaction with SLR products and their aesthetic integration with a Faxon upper receiver.

Setting up an AR-10 requires careful attention to its non-standardized nature, unlike the AR-15. Key differences lie in receiver patterns (Armalite vs. DPMS), buffer assemblies, handguards, and gas systems, which are often proprietary. While some parts like stocks and grips are interchangeable with AR-15s, critical components such as the bolt catch and charging handle are typically unique to the AR-10 platform and specific manufacturers.

This video details the critical components affecting AR-10 cycling, including buffers, gas systems, muzzle devices, BCGs, and stocks. It highlights the importance of adjustable buffers and gas blocks for fine-tuning performance, especially with suppressors or varied ammunition. Specific technical specifications for buffers and thread pitches are provided, along with brand recommendations.

This experiment, conducted by Scott DeShields, demonstrates the severe consequences of firing a bolt-action rifle with its bolt open or locking lugs compromised. By testing .223 Remington, .308 Winchester, and .50 BMG calibers with modified bolts, the video visually confirms that the bolt can become a dangerous projectile. The .308 test showed the bolt striking a ballistic dummy's face, while the .50 BMG resulted in a jammed action, highlighting extreme risks.

This comprehensive guide, presented by AT3 Tactical, demystifies the AR-10 platform, addressing the common confusion surrounding its definition and parts compatibility. It emphasizes prioritizing the rifle's intended mission before component selection and highlights the critical differences between major AR-10 platforms like Armalite, DPMS LR-308, and Knights Armament SR25. The content is delivered with expert authority, aiming to equip builders with the knowledge to avoid costly mistakes and achieve successful builds.

This guide details the process of reloading .308 Winchester ammunition, focusing on cost-effectiveness and accuracy. It covers essential steps from brass preparation and component selection to load development and final checks. The video emphasizes using a single-stage press for consistency and highlights budget-friendly sourcing for components. Instruction is provided by an experienced reloader with over 20 years of bullet casting experience.

This video details the installation of a Geissele MK8 Super Modular Rail on an AR-15. Key steps include using a Geissele Reaction Rod for upper receiver stability, proper torquing of the proprietary barrel nut, and secure installation of the gas block and tube. The rail is then slid on and secured with two cross-bolts using a T-handle hex wrench. Final steps involve muzzle device installation and a thorough inspection.

Proper ammunition storage is crucial for maintaining reliability and safety. Avoid storing ammo in cardboard boxes in damp environments, as this leads to moisture absorption and corrosion. Utilize airtight containers like ammo cans and control humidity with desiccants like silica gel packs. Heat accelerates gunpowder and primer degradation, so store ammo at stable room temperatures. Reloading primers are particularly vulnerable to moisture and require strict airtight storage.

This video demonstrates how to upgrade an AR-15's A2 furniture to Magpul components. It details the removal of the A2 grip using a Bondhus hex set and the installation of a Magpul MIAD grip with interchangeable backstraps for improved ergonomics. The process also covers preparing and installing the Magpul PRS stock, highlighting its adjustable features for cheek weld and length of pull.

This video explores the custom Remington 11-87 shotgun used as a prop in 'No Country for Old Men.' The film required a semi-automatic shotgun with a suppressor, a combination not readily available at the time. Prop master Larry Zanoff details how a non-functional, 'homemade' looking suppressor was custom-built for the 11-87, with the iconic silenced sound effect achieved entirely in post-production.