This video explores the intricacies of building and tuning AR-15 rifles with 12.5-inch barrels. The creator highlights that while this barrel length can be a 'sweet spot' for velocity, optimizing gas systems for suppressed and unsuppressed use is more challenging compared to more common barrel lengths. It questions the traditional carbine vs. mid-length gas system debate for this specific barrel configuration, suggesting neither is definitively better. The description encourages viewers to watch before embarking on a potentially 'half-baked' build, implying a need for deeper understanding of the technical challenges involved.
This video from Brownells Gun Tech™ explains the concept of 'dwell time' in AR-15 firearms. It details how the duration that combustion gases act on the operating system is crucial for diagnosing cycling malfunctions and selecting the appropriate gas system for AR-15 builds. The video highlights that gas system length (Pistol, Carbine, Mid-Length, Rifle) is a primary indicator of dwell time, with shorter systems generally experiencing higher gas pressure due to the gas port being closer to the chamber.
This video provides an out-of-the-box review and "does it run" test of a Bear Creek Arsenal (BCA) Gen 2 Side Charger rifle chambered in 7.62x39mm. The description details the rifle's specifications, including its 16" heavy barrel, 1:10 twist rate, carbine-length gas system, 15 1/4" MLOK rail, M4 flat-top billet upper receiver, BCA Bolt Carrier Group, flash hider, and right-side charging handle. It highlights features like an enhanced firing pin for steel-cased ammo and an upgraded bolt, emphasizing American-made manufacturing and a lifetime warranty. Recommendations for magazines and ammunition are also provided.
This video reviews the Ballistic Advantage 12.5" 5.56mm Barreled Upper Receiver, focusing on its features and performance. The description details the barrel's specifications, including material (4150 Chrome Moly Vanadium), finish (QPQ), profile (Government), gas system length (Carbine), and threading (1/2x28). The video aims to determine if this upper receiver is a "Great or Mediocre" option for recreational shooters, emphasizing "high value options." It also includes extensive affiliate links, discount codes, and contact information for the creator.
This video reviews the new Bear Creek Arsenal 11.5" 5.56 barrel and upper receiver. The reviewer highlights its high-end feel, softer shooting compared to other brands, and excellent finish quality, with no imperfections found after 1000 rounds of various ammunition, including steel and suppressed fire, without cleaning. Accuracy is noted as 1.5-3.0 MOA, capable of reaching 530 yards with an LPVO. The build setup includes an Anderson upper, BCA BCG, Streamlight Protac HLX, Warne mount, and Vortex Viper PST Gen 2 LPVO. The reviewer highly recommends the setup for its speed and flat trajectory.
This video reviews the Delta Team Tactical 10.5" Upper Receiver, highlighting it as an excellent budget option priced at $265 shipped. The reviewer emphasizes that the upper arrived assembled correctly and required no modifications, functioning without malfunctions using various ammunition types. Key components like the ELD Performance 416R Stainless Barrel, Davidson Defense Mil-Spec Upper Receiver, and Guntec M-Lok handguard are detailed. The reviewer aims to provide high-value options for recreational shooters and notes their lack of professional status.
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