• 4140 CMV steel
• QPQ nitride treated 
• Black finish
• .75 medium profile
• 1 in 16 twist rate
• .578/28 threading

QC10 is one of the only firearms companies that has released a AR15 style 10mm barrel! This means that you can finally custom build a Pistol Caliber Carbine in 10mm for the AR15 platform. Since the 10mm cartridge is a very high pressure round, it is important that you start with the heaviest buffer weight you will use and work down. We suggest that you start with some of the heavy buffers and extra power springs that we stock. 

For more info, visit QC10