This video provides an in-depth inspection of a returned Bear Creek Arsenal .410 upper, highlighting improvements in chamber polishing and extractor design. It also details a DIY modification process for 10-round magazines to improve their fit and function, and assesses the performance of ATI 5-round magazines, including the last-shot hold-open feature.
This guide details the construction of a unique .410 AR-pattern firearm classified as non-NFA. It covers the assembly of the upper and lower receivers, installation of a proprietary gas piston system, and selection of appropriate magazines for .410 shells. The build emphasizes legal compliance by maintaining an overall length exceeding 26 inches and avoiding features that would classify it as a pistol, rifle, or shotgun. Expert insights are provided on navigating NFA regulations and ensuring reliable function with .410 ammunition.
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