22 Evolution LLC

Charles C Kelly

John L Overstreet

Jordan Bowles

Tyson Bradshaw

Craig Pudil

Taz B Pfefer

The present invention teaches an insert locking mechanism incorporated into a sub caliber action device, installable within an upper receiver of an AR-15 type firearm, and which interfaces with an upper receiver mounted forward assist for use with such as .22 caliber ammunition and in order to eliminate movement or play of the chamber insert adaptor associated with the substituted sub caliber action. The mechanism includes a generally cylindrical shaped body supported upon the action and exhibiting a plurality of radially projecting and circumferentially extending lugs which are configured to mate and seat within a plurality of grooves circumferentially arrayed within a barrel defined in the upper receiver.

Chamber insert lock installed within an AR-15/16 barrel extension for locating and reducing movement of an associated sub caliber action

A sub caliber action device installable within an upper receiver of an AR-15 type firearm which interfaces with an upper receiver mounted forward assist for use with such as .22 caliber ammunition. The device includes a generally elongated receiver plate exhibiting a generally lengthwise extending notched interior established between extending sides, with the notched interior seating a bolt and a forward assist adaptor in reciprocating fashion along the receiver plate between an end-most location and a forward secured chamber adaptor. The adaptor is reconfigurable to inertially and linearly displace a limited distance relative to the bolt support sleeve during full auto firing mode and which influences the bolt against the chamber adaptor during striking of the bolt supported firing pin by the hammer.

Modified bolt assembly with forward assist adaptor for accomodating sub caliber ammunition utilized in an AR-15 type firearm

A maintenance kit incorporated into operable components of a sub caliber action device installable within an upper receiver of an AR-15 type firearm for facilitating disassembly, maintenance and reassembly of a bolt and forward chamber adaptor with a receiver plate. The kit includes at least one gauge dimension defined in a barrel of the forward chamber adaptor for establishing a correct spacing between lengthwise extending and interior notch defining arms associated with the receiver plate. A modified guide rod facilitates at least one of disassembly of the bolt firing pin/extractor and cleaning of the chamber adaptor interior prior to reassembly of the bolt and chamber adaptor.

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Kirksville, MO, United States of America

Charles C Kelly