Quarter Circle 10 Side Charging Uppers

Ray I.
by Ray I.

Quarter Circle 10 debuted their aluminum AR lowers that accept Glock mags last year, they now have a non-reciprocating side charging upper on the way. It works with any of Quarter Circle 10’s blow back bolt assemblies ( sold separately) and also works with their 9mm, .40S&W, .357 Sig and .45ACP barrels (also sold separately). The Quarter Circle 10 Side Charging Uppers are currently on pre-order and pricing is still TBD, check out quartercircle10.com for more info.

Our upper features a non-reciprocating charging handle. This allows the operator to remain in the firing position while charging the firearm. You can easily pull the charging handle to the rear and active the bolt catch with one hand in one motion. This upper was designed around mil-spec standard and will accept any of our blow back bolt assemblies. This upper has an enlarged ejection port and will fire pistol calibers from 9mm to .45 ACP. Our upper has a trap door in the rear to keep dirt out of the upper and allow easy removal of the bolt from the receiver.

Ray I.
Ray I.

Long time gun enthusiast, Sci-Fi nerd, Whiskey drinker, online marketer and blogger. My daily firearms musings can be found over at my gun blog ArmoryBlog.com and Instagram.Shoot me an email at ray.i@staff.thefirearmblog.com

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2 of 16 comments
  • Large frame lower + 10mm Glock mags + 10mm DI upper from RMW = bad-ass 10mm carbine with none of the disadvantages of blowback.

  • Ben Ben on Aug 17, 2015

    This after I mated a Wilson barrel, JP bolt, and Gibbz/Spartan side charger to solve the problem.