The present invention is an improved quick change barrel system for a firearm. It features an interlocking trunnion and lock ring that hold the barrel in place proximate the receiver. Intermittent threading provides multiple points of interface. A foldable handle is provided to allow safe removal of the lock ring and additional torque for attachment and removal of the lock ring from the system.

 
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< Multi-function optical system and assembly

> Ignition element

> Structural system with high absorption capacity to impactive and impulsive loads

~ 00540