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seeing that is says you live in so cal...I guarantee you have never fired an M4 or an M16 (edit unless you have been in the military). M4 being a 14.5 inch barrel makes it an SBR and Full auto and an M16 just being full auto. I can fire a thousand rounds of silver bear (cheap russian shit ammo) through my AR15 never clean it and it will still keep shooting and grouping on target
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