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.
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