7.92x33 AR pistol

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CarJunkieLS1

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For several months now myself and a friend has been sourcing parts and putting together, we believe to be the only 7.92x33 AR pistol in existence. Well a few days ago the barrel work was finished by my friend so today we put it all together and got to testing. Well IT WORKS.

Factory PPU 124fmj ammo cycled and locked bolt on empty mag. It was anemic at 2180fps. Tested 3 powders today CFE BLK, A1680, and Lil Gun. Load data is very hard or in most cases impossible to find, so some smart educated guesses were made and with help of Quickload we got off and running.

The barrel is 12 3/4 inches and all testing was done with New Primed PPU brass and Hornady 125gr HP.

The following data may or may not be published data USE AT OWN RISK.

28.3 CFE BLK 2304fps
22.5 Lil Gun 2417
28.5 A1680 2485

CFE BLK cycled, fed, and locked open.

Lil Gun had weak ejection, did feed another round, and failed to lock open.

A1680 cycled, fed 4 o'clock ejection but failed to lock open. A1680 is the winner so far but will take some gas port tweaks to get it to lock open.
 
This has been done before. I remember stumbling across something very similar in an archived thread for another forum.

Who did you have make the barrel? Do the rounds feed from a 7.62x39 AR mag? What bolt head did you end up using? I ask because it's something I have been looking at building (just as a rifle).
 
This has been done before. I remember stumbling across something very similar in an archived thread for another forum.

Who did you have make the barrel? Do the rounds feed from a 7.62x39 AR mag? What bolt head did you end up using? I ask because it's something I have been looking at building (just as a rifle).

Not in an AR pistol it hasn't, I've seen it done in a AR rifle that my friend built 5 years ago. And another AR rifle was built but by someone else it was essentially a single shot. Never could get a magazine to work.

The magazine is the problem, NO available mag will work reliably without heavy modifications. These required modifications are what makes the rifle run like it should. I'm sworn to secrecy on the magazine's as my friend designed and built them.

The barrel was a McGowen blank that we ordered and we did all the machine work ourselves.

Pictures will come in time, yesterday was just to function test and get a little real world data, barrel is off to use as a pattern for another one and to be bead blasted and cerakoted.
 
Cool! It’s always neat to read about projects using different calibers and modifications to work correctly.

We’re looking forward to seeing the build pics along with reading more about how it’s working. :thumbup:

Stay safe.
 
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