Did our old mags still work after testing - do they still function?

This video from Line45, hosted by Scott, explores seven surplus rifles that rival or surpass the AR-15 in durability, power, and real-world utility. It delves into the historical context, mechanical features, and ballistic performance of iconic firearms like the Mosin-Nagant, Mauser M48, Lee-Enfield, M1 Garand, PTR-91, WASR-10, and Zastava M70, highlighting their robust construction and suitability for harsh conditions.

Elliott Delp reviews a unique Global Ordinance AR-15 upper receiver featuring a monolithic barrel design, integrating the muzzle device, gas block, and barrel into a single unit to eliminate potential failure points. He demonstrates how to effectively regulate gas for suppressed fire using an adjustable bolt carrier group, highlighting its flawless performance and correct gassing.

This AT3 Tactical video seeks community input for their AR-15 barrels guide, specifically focusing on the optimal barrel length. The instructor, demonstrating expertise through a multi-episode series, encourages viewers to share their opinions and justifications for the 'absolute best' barrel length. This interactive approach aims to gather diverse perspectives for an upcoming episode.

This video from Regular Guy Training LLC, featuring the BRN-4, delves into the practical differences between piston-driven and traditional direct impingement AR-15 systems regarding carbon fouling and long-term reliability. The instructor, demonstrating expert-level knowledge, highlights how piston systems maintain a cleaner action for significantly more rounds, contrasting it with the fouling inherent in direct impingement designs. The discussion also touches upon potential storage-related issues in piston ARs after extensive suppressed use.

Instruction from Regular Guy Training LLC highlights that the BRN-4 is not a perfectly clean-running system due to its internal piston design, which forces debris into the receivers. Regular cleaning is essential, especially after suppressed fire, where brass flecks can accumulate. This expert insight emphasizes proactive maintenance for optimal firearm performance.

This review highlights a significant quality control issue with a new Daniel Defense MK18, specifically a loose handguard that rattles and moves. The reviewer, demonstrating clear expertise, warns against mounting precision optics or lasers due to this instability. The video also contrasts this experience with cheaper firearms and promotes Sonoran Desert Institute for gunsmithing education.

This video showcases a novel magnetic optic mount for pistols, demonstrating its quick attachment and detachment capabilities. The speaker tests its retention by racking the slide, highlighting its potential as a firearm innovation. While initially shown on a Glock, the mount is available for other platforms like Sig Sauer and HK.

The EOTECH OGL is a compact, deck-of-cards-sized on-gun laser system featuring co-aligned visible and IR aiming lasers for simplified zeroing. It utilizes advanced VCSEL laser technology and includes a unique sliding lever to adjust the illuminator from spot to flood patterns. This tactical accessory was a notable introduction at SHOT Show 2023.

This video showcases the innovative Full Conceal M1 system for the Sig P320 and a prototype folding Glock 19. The M1 system offers a smartphone-like footprint with 18+1 capacity and a $899 price point. The folding Glock 19 prototype, chambered in 9mm, boasts a 23-round capacity and a unique folding mechanism for enhanced concealability and rapid deployment.

Proper installation and maintenance are crucial for all firearm sighting systems, not just red dots. Witness marks on red dot sights ensure screws remain tight, preserving zero. Even iron sights can fail if not properly secured, highlighting the need for regular checks on both mechanical and electronic optics. This content emphasizes proactive gunsmithing for reliable performance.