Home AR-15 How to Assemble a QC10 Upper Receiver (9mm AR)

How to Assemble a QC10 Upper Receiver (9mm AR)

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This week we finish our two-part series about assembling an pistol caliber AR.

Upper Parts:
Palmetto State Armory Forward Assist and Ejection Port Cover
Quarter Circle 10 9mm Bolt
Quarter Circle 10 9mm Barrel
Seeking Precision MSCR V2 Handguard
Specialty Tool Solutions Mil-Spec Upper Receiver
Specialty Tool Solutions Charging Handel

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15 COMMENTS

  1. How many spacers can with the barrel nut? How many did you use? Did you put one spacer in the barrel nut before the first tightening and then put a second spacer in the barrel nut before the 2nd tightening?

  2. If you dont keep the torque wrench 90° from the barrel nut wrench the torque is not correct. Also you should lock tight the rail screws with blue locktight to keep them from getting loose

  3. I’m building a 9mm PCC for steel challenge type matches. Since this is my first build can you post a list of tools needed to build the upper receiver/barrel assembly?

  4. So obviously you have SBR paperwork for this since you have a forward grip.(Front grips are illegal on AR pistols.). So, why didn’t you put a stock on it instead of a pistol brace?

  5. Correct me if I am wrong but using that barrel nut wrench will give you a longer overall torque wrench length and subsequently give you an erroneous reading. Does the material included with that tool give you the formula to determine what the adjusted torque value should be? If not it seems like you would inadvertently over-torque your barrel nut.

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