Build a 9mm PCC – Quarter Circle 10 Side Charging QC5 Builder’s Kit

By Rex Nanorum

U.S.A. –-(Ammoland.com)- If you’re a big fan of AR platform Pistol Caliber Carbines (PCC’s), you’ve likely heard of Quarter Circle 10 before. If you’re like me and have less experience with these diminutive lead-spitters, QC10 might be a bit of a new name in your mental Rolodex. To put it simply, QC10’s intent is to position themselves as the one PCC-well you’ll ever need to draw water from.

Quarter Circle 10 specializes only in AR pistol carbines, with chamberings in 9mm, .40SW and .45 ACP. They have lowers compatible with Glock, Colt, Sig, and Mp5 mags. There are other options as well (side charging versus rear charging, skeletonized receivers) but the bottom line is you won’t find any rifle caliber specific parts here.

Quarter Circle 10 Side Charging QC-5 Builder’s Kit

QC10 sent me a “QC-5 builder’s kit” with an MP5 mag-compatible lower, side-charging upper, 5.5″ 9mm barrel, G9 bolt assembly and adjustable-weight buffer. Knowing how few and far between short AR handguards are, QC10 even offers M-LOK and Keymod handguards as short as 4.44″, and was kind enough to include one for the article.