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I voted 9mm.
Especially if you own any Glock in 9mm and the ever increasing amount of Glock based lowers becoming available.
7.62x39 is a great option just stick to 20 rounders or 10 round mags. Also there are a few tricks to making a 7.62x39 AR run a bit better. The biggest issue is the taper on the cases trying to feed up the last portion of the mag, where it is primarily straight. It is a very permanent fix but it helps. Basically you would create one large feed ramp. Then extend it past the barrel to the receiver. This allows the "not facing the right direction" rounds to feed a bit better. The taper allows the round to sort of point down at times. Which means the round gets jammed into the flat portion of the upper receiver. Basically your creating a large feed ramp, like that of the AK47.
However in my opinion, if I were to add 7.62x39 to my list of calibers, I would most certainly just buy an AK47. Building an AR in the caliber would likely be around if not over the cost of an entry level AK.
Especially if you own any Glock in 9mm and the ever increasing amount of Glock based lowers becoming available.
7.62x39 is a great option just stick to 20 rounders or 10 round mags. Also there are a few tricks to making a 7.62x39 AR run a bit better. The biggest issue is the taper on the cases trying to feed up the last portion of the mag, where it is primarily straight. It is a very permanent fix but it helps. Basically you would create one large feed ramp. Then extend it past the barrel to the receiver. This allows the "not facing the right direction" rounds to feed a bit better. The taper allows the round to sort of point down at times. Which means the round gets jammed into the flat portion of the upper receiver. Basically your creating a large feed ramp, like that of the AK47.
However in my opinion, if I were to add 7.62x39 to my list of calibers, I would most certainly just buy an AK47. Building an AR in the caliber would likely be around if not over the cost of an entry level AK.