AR47 pistol Upper

[hendo]

Does anyone here have a AR47 Pistol Upper that mounts to a standard AR15 lower? And works reliably? Considering one, but there are not a ton of options. PSA used to make one but now you have to use their proprietary lower.

Thanks for the responses below. My apologies, I should have said that I was specifically looking for a pistol upper in 7.62X39.

Any pistol upper users