Due to ATF final rule 2021R-08F, all Quarter Circle 10 Full Pistol Builds will no longer come with pistol braces installed or included.
Please contact us if you have any questions before ordering.


Availability: In stock
QC-RNG-9-5.5-Mini Mayhem
Quarter Circle 10, The AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts.

Shipping & Returns

Shipping: All orders are shipped within 72 hours Monday -Thursday 6am - 4pm Arizona Time.

Any order containing a lower receiver will not be shipped until we receive a copy of your FFL. Once received regular shipping policies apply. Submit your FFL Here.

Holiday Shipping: The QC10 Shop is closed from December 223rd-January 2nd. During this time, shipping will also be closed. You order will be processed on Jauary 2nd and will ship out the same or next week. Please double check your shipping information as well as get your FFL info in so that your order will not be delayed. 

Returns: Quarter Circle 10 offers a 30 day return, refund and exchange policy. See Details.

A special full build offered by QC10 focused on being compact and matched with premium components. The provision of a folding stock and short upper at 5.5” that is made for Glock double stack 9mm magazines for last round bolt hold open, results in an amazingly capable package. Avoid potential headaches from mixing other brands, knowing the Mini Mayhem has been thoroughly tested and is supported fully by QC10’s lifetime warranty and recognized customer support. Optics and Accessories not included.

  • Billet 7075-T6 Aluminum Engineered for 9MM Double Stack GLOCK® Magazines 
  • Type III Hard Coat Anodizing QC10 
  • Proprietary Universal 9MM Law Tactical Modified Bolt Assembly
  • Last Round Bolt Hold Open on Empty
  • Non-reciprocating Adjustable Buffer System
  • Enhanced Mil-Spec Trigger
  • Magpul MOE Grip
  • Radian Talon Ambidextrous Safety Selector
  • QC 10 Radian Raptor Ambidextrous Charging Handle
  • Includes (1) 9mm 33-Round Factory Glock Magazine
  • Includes Carrying Case DOJ Cable Lock Included


*Optics Shown on the Mini Mayhem do not come with the firearm. This is for photography purpses only* 

Quarter Circle parts are designed to work within mil-spec perimeters. However, for optimum performance we recommend using QC10 parts for all your core elements, (receivers, bolt, barrel and adjustable buffer system). Made for- Not Modified. Every QC10 product is engineered specifically for pistol caliber ammunition, not modified from an existing platform, increasing functionality, reliability and overall performance.

All orders containing a complete pistol must be shipped by 2 Day Air to a licensed, Federal Firearms Dealer (FFL). Please have your FFL email us a copy of their current Firearms license. Orders cannot be shipped without one.


Due to ATF final rule 2021R-08F, all Quarter Circle 10 Full Pistol Builds will no longer come with pistol braces installed or included. Please contact us if you have any questions before ordering.

Important Warranty Note: 

If you intend to register your Quarter Circle 10 firearm as an NFA weapon, test it thoroughly before doing so in a Title 1 Configuration.  Once you Form 1 or Form 2 it, you are legally the manufacturer, and we cannot service the firearm.  Should your firearm require warranty replacement we can only replace it with a Title I receiver and we are not responsible for tax stamps or NFA fees.