PSA KS-47 – Compatibility PSA

Hot on the success of the CMMG Mutant, Palmetto State Armory released their 7.62×39 AR hybrid, instead opting for compatibility with the AR-15 platform versus its own proprietary system. Originally shown at SHOT 2016 and shot at the Big 3 East in the spring, the KS-47 has begun shipping and now with bare receivers available, is now the subject of some compatibility issues.

As PSA stated in their videos released at Big 3, the lower is (paraphrase) “compatible with other companies 7.62×39 upper receivers,” which while factually true in terms of their pin placement will have a functional issue. The root cause is the combined usage of an AK-47 magazine and a “standard” AR-15 upper. The AK magazine has wider and taller feed lips compared to the STANAG pattern.

When attempting to mount a “standard” 7.62×39 upper to a KS-47 lower, the feed lips of the AK magazine interfere with both the receiver itself and the bottom of the bolt carrier group (though the bolts do clear). As such, mounting a “standard” receiver is not possible without having a machine tool to mill the sides of the receiver and bottom of the bolt carrier group.

That said, receivers specifically designed to handle the AK magazines will work. Options from Michael’s Machines, MGI, and others are typically drop-on compatible.

PSA has intimated that they will be offering their upper receiver as a set in the near future, but home-builders and dreamers should ensure they have compatible options / machine tools prior to the building process.


Nathan S

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


  • Big Daddy

    I have a Muntant I am very happy with, very accurate and reliable.

    I lost trust in PSA a while ago. They used to carry good quality Mil-spec parts for a great price and no longer do, like FN barrels. They also promised a lot of things they never delivered on. I’ll pass on anything PSA now.

    • J.T.

      They still carry the CHF FN barrels. Their selection is just shitty.

      • Big Daddy

        They used to have so many of them in different lengths now no. They had all mil-spec AR parts and kits for very reasonable prices, now no.

        They were supposed to start making great inexpensive 1911s? .308 ARs? AKs? 9mm ARs? Now the KS-47. They start something and never seem to get it right and finish the job as well as keep parts available for those guns.

        That’s just not a company i want to deal with anymore.

        Every FSB was canted on the uppers I bought. One upper and not a blem and the pin holes were out of round.

        I’ll pass on PSA except for cheap ammo. They have great ammo sales if you don’t mind waiting for them to ship it.

        Oh and in the past they had 2-3 week waiting periods for shipping. At least they sped that up a bit.

        I don’t speak negatively about a company unless I’ve had more than a few negative experiences with them. I have now with PSA.

    • Cal S.

      They seem to have set themselves as a direct competitor to Model1 Sales as a poor-man’s AR company. I applaud them for that.

      I don’t have a problem with my PSA upper at all, though I will likely replace the BCG at some point.

  • Phaedrus

    I have a MGI AK lower with the KS47 upper. Working on a video for it, but it seems to function properly. Pmags go in and out a bit better than my Polish mags though.