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Questions & Answers
Does it work with New Frontier C-5 lowers? Expert Answer

The Quarter Circle 10 AR Side Charging Upper Receiver is compatible with the QC10, GSFGLF and CLT9MM Lowers. I recommend contacting the manufacturer to confirm compatibility with the C-5 Lower.

by Hunter, Gear Expert, August 2, 2022
Will this upper work with a 22lr bcg? With the side charging? Expert Answer

The Quarter Circle 10 AR Side Charging Upper Receiver may be able to work with a .22LR BCG depending on the BCG. I recommend contacting Quarter Circle in regards to compatibility of the Quarter Circle 10 AR Side Charging Upper Receiver with the specific BCG you are wanting to use.

by Hunter, Gear Expert, August 5, 2022

Product No Longer Available

Unfortunately Quarter Circle 10 AR Side Charging Upper Receiver is not listed by OpticsPlanet.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

Product Info for Quarter Circle 10 AR Side Charging Upper Receiver

The Quarter Circle 10 Side Charging Upper Receiver is a highly rigid upper receiver designed specifically for pistol-caliber AR builds. Our upper receiver design is derived from the industry-first Gibbz Arms G9 receiver, and with the help of Gibbz engineers and our pistol caliber expertise, we've brought you the best possible choice for a dedicated pistol-caliber build.image

Features of Quarter Circle 10 AR Side Charging Upper Receiver:

  • Latching non-reciprocating left side charging handle;
  • Spring-loaded rear door minimizes blowback when firing suppressed;
  • Widened ejection port for clean ejection of large-bore cartridges;
  • Slick side aesthetic perfectly complements QC10 Lowers;
  • Compatible with GSFGLF and CLT9MM Lowers;
  • This model not compatible with QC5 lower or QC10 Keymod Handguards;
  • QC10 Side-charging uppers designed and manufactured with Gibbz Arms technology;
  • Handguards with overlapping anti-rotation tabs may not be compatible with QC10 billet upper receivers including Side Charging uppers;

Package Contents:

  • Quarter Circle 10 AR Side Charging Upper Receiver

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Quarter Circle 10 AR Side Charging Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

Quarter Circle 10 Side Charging Upper Receiver, Pistol Caliber AR-15, Black Anodized, QC-PSCU-S , MPN: QC-PSCU-S , UPC: 2797854 , Code: 3KL-UPR-SCUR-QC-PSCU-S
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