Proprietary Feed Ramp, contoured specifically for 9MM ammunition, ensures feed reliability and increased ammunition compatibility.
1/2-28 Threading
4150 CMV Steel
1-in-10? twist rate
QPQ Nitride Treated
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.
Note:
*Barrels are measured from the end of the muzzle to the end of the breech/feed ramp. Approximately1” of the barrel rests inside the upper receiver upon installation, resulting in an installed length of 1? less than listed overall length.
*The installation of a pistol-caliber suppressor requires the use of a fixed barrel spacer. See your suppressor manufacturer for information on the requirements of your particular model.
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