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On most semi-automatic firearms the slide or bolt will stay in the rearward position when the last shot is fired and the follower of the magazine engages the bolt catch. This quickly lets you know the magazine is empty and allowed you to reload and then use the slide/bolt release to chamber the next round of the loaded magazine. It is not necessary to have for the firearm to work, but is a feature many shooters like.
The CBC Industries AR-9 Complete Upper Receiver Pistol Kit should be paired with a heavier 5.4 to 7.4 ounce buffer in order to function reliably. A 3.5 ounce buffer would be too light for a 9mm PCC.
The CBC Industries AR-9 Complete Upper Receiver Pistol Kit includes all the components needed to build an AR9 except a stripped lower. So besides the lower, no other components will be needed.
Yes, the CBC Industries AR-9 Complete Upper Receiver Pistol Kit includes a full-auto BCG and a charging handle.
The CBC Industries AR-9 Complete Upper Receiver Pistol Kit uses a 1/2x36 thread pitch and includes the Afterburner Compensator.
Yes, the CBC Industries AR-9 Complete Upper Receiver Pistol Kit will work on an AR9 lower.
The CBC Industries AR-9 Complete Upper Receiver Pistol Kit uses M4 feed ramps and features a Mil-Spec Forward Assist, Mil-Spec Dust Cover, and Brass Deflector.
The barrel thread is 1/2x36
Yes the upper is a complete upper reciever.
* Lower receiver options include using standard AR-15 lower with a mag conversion kit or optionally you can mate this product with a dedicated 9mm Glock style lower receiver. Yes, standard Glock mags will work with this kit. No, they do not supply a magwell conversion, if you were going to convert a standard AR lower, you would need to source a conversion magwell.