Mark Serbu, a firearm designer with extensive experience, reviews a 9mm AR-15 upper. He details the use of Glock magazines with a magwell adapter and analyzes the impact of bolt velocity on trigger slap, particularly in full-auto configurations. Serbu demonstrates how a heavy buffer and stouter spring can significantly reduce the rate of fire and improve handling, comparing it to factory Colt designs and noting the jarring bolt impact even in semi-auto.
This review explores the EndoMag 9mm conversion for AR-15s, highlighting its cost-effectiveness for training. While it offers a familiar manual of arms and cheaper ammunition, reliability is heavily dependent on the upper receiver. The Faxon Firearms upper performed well, but the FM Products upper experienced significant malfunctions, indicating potential compatibility issues.
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