This upper receiver is manufactured to simply accept Colt SMG magazines because of its modeling to the revered Colt Sample PCC. Nonetheless, it’s fantastic to understand that it may also contend with Glock magazine-fed reduced receivers in addition. So you have some scope right here to construct a PCC together https://cristianatdnw.affiliatblogger.com/78831189/what-does-colt-smg-upper-mean