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.

Blu Whistler (P320) Side Charging 9MM Builders Kit

In stock

Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts.

From $949.95

To $979.95

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.

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Blu Whistler (P320) Side Charging 9MM Builders Kit
Blu Whistler (P320) Side Charging 9MM Builders Kit

In stock



    The QC10 Builders kit is for the customer that realizes the importance of high quality matching core components. The kit includes a QC10 lower and upper receiver with proprietary parts, a barrel of desired length with a patented bolt and an adjustable buffer assembly. This represents the essential bones of a great pistol/carbine build and the reassurance that the parts contained within the kit are made for, not modified, the chosen pistol caliber.

    • Builder's Kit includes the "bones"- the core components for building your own Quarter Circle 10 Carbine or Pistol

    • QC10 Stripped Blu Whistler (Sig P320) Lower Receiver with proprietary parts

    •**GIBBZ Arms Patented Left Side Charging Handle Pat. No. 9,310,146

    • 9x19mm barrel in your choice of 5.5", 7.5", 10.5", or 16" length

    •Patented Universal 9MM Bolt Assembly

    •QC10 Adjustable Buffer Kit  

    • Made For the AR Platform- Not Modified