MasterPiece Arms MPA 930SST Mini MAC 10 First Impressions Review

| November 17, 2014 | 12 Comments

I knew I was screwed when I saw B. R. Kurtz’s MPA 30SST MAC-10. I had been kicking around the idea of getting a MAC-based firearm ever since we started our struggles with an SBR Glock enclosure. I laid the idea to rest, until the full-sized SBR MAC made its way to our site.

There were a few other projects I needed to get in decent shape before I pursued the MAC option. During this period of time, prices were stable at around $475 or so for the “mini” MAC 930SST. Then the price dropped to $355 (credit price) on Bud’s Guns, and as I was deciding on whether or not to start the project the price jumped back up to $450.

Fortunately I was able to find a new in box MPA 930SST for sale from for $359 shipped. A few days later I picked it up at a local FFL and last Friday I kicked off the Form 1 via eForms.

Saturday was our last outside shooting day for 2014. I wanted to take the opportunity to test out the MAC-10, even for just a few break-in rounds. We had other things on the agenda, so I didn’t have a ton of time to futz around.

Here are the first impressions:

Dimensions and features

The “Mini MAC” is definitely small, with a 4.5″ barrel. The entire pistol is 8″ overall, not including the  fake suppressor. Including the fake suppressor, the MPA 930SST is 12 3/8″ long. We’re going to leave our off.

With the fake suppressor installed, the 930SST weighs 4 pounds (1.8 kg) on the dot. Without: 3 pounds, 5 ounces (1.5kg).


Shooting impressions

My shooting day with the 930SST was cut short because the factory (TAPCO-made) caused repeat malfunctions. I experienced a double feed, and the 930SST would strip the top round off of the magazine, flip it sideways, and “sidepipe.”

I brought a loaded 20-round converted STEN magazine with me. I fired a few rounds on camera this way, but forgot to turn the camera on while I was testing the rest of the magazine and if the charging handle reciprocated (it doesn’t). The magazine functioned just fine, without a single hiccup. All steel mags for me. I’ll be doing a tutorial on how to return the 20-round Israeli mags to their original 32-round capacity and how to refinish the magazines at a later date.

The MPA 930SST ships with a piece of tubing over the trigger, but trigger slap is still severe. I haven’t felt this much trigger slap in a firearm since I owned an SAR-1.

I mounted a Primary Arms holographic reflex sight (now discontinued) on the MAC. Co-witnessing is impossible with any kind of optic mounted unless you were to put it on a very, very tall riser. Even then I don’t know how good of a co-witness you’d get. At the distances we’d expect to use the MAC, it’s probably feasible to just use the “window” of the optic as an improvised reference point.

The charging handle is a little stiff and hard to pull back. I wonder if the action will break in as we shoot it more; we’ll find out once I install the stock.

The MPA 930SST comes with an extended magazine release. The mag release on MAC firearms is at the bottom of the grip, European-style. The extended release protrudes about 3/4″ and is pretty easy to depress. Apparently newer MPA30 ship with the same release; otherwise you can buy an aftermarket one.


Due to our schedule, the weather, and the TAPCO magazine, I only gave the MPA 930SST a very quick workout. I look forward to getting my stamp for this weapon and installing a vz 58 stock. Once that’s done you can expect a much longer review. I hope this weapon will replace our SBR Glock as our ultra-compact stocked PDW.

About the Author:

Short Barrel Shepherd Short Barrel Shepherd is a regular guy and works to make Web sites and mobile apps easier for people to use. He spends his free time attending fight-focused firearm, knife, and combatives training, motorcycling, writing, and playing games. His daily carry is a Glock 19 pistol and an AR15 .300 Blackout pistol in a backpack.
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12 Comments on "MasterPiece Arms MPA 930SST Mini MAC 10 First Impressions Review"

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  1. David says:

    I thought MPA fixed the trigger slap on their guns?

    Also, be advised that Primary Arms does manufacture a RMR/FF-style dot now, but it’s not rated for shotguns:

    I think the new Uzi Pro pistol, when it comes out in February, is going to be a very interesting competitor in this market space, especially since it seems to run on ASC Colt mags.

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Thanks for the head’s up about the PARRS02 sight from Primary Arms. That looks like an updated version of what I own 🙂

      I’ll investigate the trigger slap ; it’s quite possible it was even worse than what it is now!

      I hoped to shoot the UZI Pro at SHOT Show 2014, but they said they were “working out some problems.” We’ll see if I can get my hands on it at SHOT Show 2015.

      • David says:

        IWI-US informally announced the UPP is being released in February. Word on the street is that their “QC problem” back with the original imports was that it had some trouble staying semi-auto. 😛

        Definitely looking forward to your SHOT coverage. 🙂

  2. Jaime says:

    Nice review, thank you.

    I have this MPA Mini, top cocking, and its a blast to shoot. I use the Tapco mags and have not had any issues with them at all – they function fine for me, with about 1,000 rounds through the Mini. Its also very accurate out to 25 yards (haven’t been to outdoor range to try longer distances) without any optics. Very glad I purchased this pistol.

    Looking forward to your review on the Sten mags because I too was wanting to try them. Thanks again.


  3. B R KURTZ B R KURTZ says:

    As youu know my “MAC” is the full size “M-10” clone, which I had SBRd using the VZ58 folding stock. I debated the side cocking VS top cocking (original “MAC” style) versions. Ultimately I chose the side cocking version so I could use optics (my choice is a RMR). The drawback of the side cocking version is that it makes it wider than the top cocking type–its a real consideration if you want to bag carry it. So decide if you want optics OR a slimmer profile.

    If I have any complaints that I wish MPA would fix, its the ability to use original “MAC” stocks. The original stocks made a really compact package. I have used both real and fake suppressors as front hand grips, but Im most happy with the original web strap as a handstop.

    Looking at your pics of the Mini MPA, my first impression is WOW thats a Micro Uzi and screams for a stock.


  4. Jaime says:

    Question regarding the MPA 930 – would it be legal to add a buffer tube to the pistol, whether or not one added the SIG arm brace? Short of requesting a determination letter from the ATF, I’ve not found any info that would indicate whether it is or it isn’t.

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Hello, you are 100% correct. The ATF has not issued an opinion letter one way to the other. The only opinion letter they have issued was in regards to the SB15 on an AR15 pistol. THAT letter has some conflicting inference in it, including reference to “AR-type” firearms which might indicate it’s NOT okay to put a pistol tube on a non-AR, but in another paragraph has language that insinuates it WOULD be okay.

      It may or may not be enough comfort for you, but there are many companies that are selling non-AR platform weapons with AR pistol buffer tubes, and therefore okay for a brace.

      I am not a lawyer, this is not legal advice, and in the end you have to do what’s right for you. Unfortunately I can’t give you a definitive answer.

  5. Jon says:

    I started the same project-am waiting for my Form 1 to come back. By the looks of things you may have an older model-the newer ones have better traditional sights. Check to see if you have the newer two part hammer as well that is supposed to make trigger slap bearable. Also MPA sells “upper receivers” with different length barrels (6 and 8) and top/side charging options for about $150. I’m considering having a few configurations to try out-including seeing if a red dot on the rear of a top charging rig would be practical-as it’s an inexpensive investment.

    I’m familiar with the vz stock from other projects but I’m curious about your plans to mount it. The easiest is to put a nut inside the rear of the receiver but I’m wondering if that would limit bolt travel too much by putting the spring under too much tension. What are your plans?

    • Short Barrel Shepherd Short Barrel Shepherd says:

      That’s exactly what I intend to do. I don’t know if you read BR Kurtz’s write up here, but I hope the shorter 930 doesn’t cause a problem.

  6. Jon says:

    FYI-I was able to mount the vz stock using the screw it comes with into the back of the receiver. I mounted it as low as possible so it’s almost flush with the bottom of the receiver, and shortened the screw by a few millimeters so it doesnt stick out into the internals. It has good contact with 5 threads and feels very stable. I also asked MPA about producing a safety on both sides of the receiver and they are putting one into production so keep your eye out for it. As is, the folded stock blocks easy access to the right hand side of the receiver. Have to get to the range next-but as is its a very cool little package. Cdnn sells an excellent condition sten mag with a tapco mag for about $18, and Centefire has a deal for 10 sten in used condition for about $40.

  7. Pierow says:

    You mention bringing a “loaded 20-round converted STEN magazine”. Are you referring to converting from 20 to 32 rounds or was there an additional conversion required for the magazine to function with the 930SST?

    • Short Barrel Shepherd Short Barrel Shepherd says:

      Israel converted a bunch of 32 rounders down to 20 round single stack magazines. I have a tutorial on how to re-convert (unconvert?) them on the blog.

      Either way, no modification is necessary for the 930.

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