MasterPiece Arms MPA30SST: The Semi-Auto MAC-Style 9mm, Explained

On the shelf, Yerington, Nevada

The MasterPiece Arms MPA30T is a semi-automatic 9mm pistol built on the MAC-style platform, with a top-mounted cocking handle, an aluminum lower receiver, adjustable front and rear sights, a quick magazine release, and a 1/2x28 threaded barrel. It ships with one 30-round magazine and a gun case, and it carries a lifetime guarantee. Dark Horse Guns & Ammo has two in stock in Yerington right now.

That last part is worth pausing on. MasterPiece Arms currently lists the MPA30T as available on backorder, with a three to four week processing window on direct orders at $540. We have two on the shelf. If you want one, the wait is however long it takes you to drive to Goldfield Ave.

What is the MPA30T?

The MPA30T is part of MasterPiece Arms' Defender series, chambered in 9mm Luger. It looks like a submachine gun and fires like a pistol, because that is what it is: a closed-bolt, blowback, semi-automatic handgun. One round per trigger pull, every time.

MasterPiece Arms has been building firearms since 2000 out of Georgia, running most production in-house on CNC machines. They are better known for precision bolt-action rifles and competition chassis systems, which tells you something about the machining standards the Defender series inherits.

The "T" in MPA30T stands for Top cocker. That single letter is the most important thing on the spec sheet, and it is worth its own section.

Top cocker or side cocker: what is the difference?

MasterPiece Arms builds this pistol both ways, and the two are not interchangeable.

On the top cocker, which is what we have in stock, the cocking handle sits on top of the receiver and travels in a slot along the upper. This is the traditional MAC and Cobray layout, and it is how the original guns were built.

On the side cocker, sold as the MPA30SST, the handle moves to the left side of the receiver and MasterPiece Arms adds a scope mount. Their own manual is explicit that on the side cocking models the handle does not move as you fire. The clear implication, and the reason the side cocker exists, is that the top cocking handle does travel with the bolt.

What that means at the range: keep your support hand clear of the top of the receiver. It is not a defect, it is how the design has always worked, but it is the first thing to know before you shoot one.

The second difference matters for anyone who wants an optic. On a top cocker the cocking handle occupies the real estate along the top of the receiver where a rail would otherwise sit, which is why MasterPiece Arms lists a scope mount as a feature of the side cocking model rather than this one. Mounting an optic on a top cocker is not impossible, but it is not a drop-on proposition either. Come handle ours and we will show you what does and does not clear the handle.

Where does the MAC-style pistol come from?

The design traces back to Gordon Ingram's MAC-10 and the Cobray M11/9 that followed. The originals were open-bolt, stamped-steel, select-fire guns known for putting rounds in the general direction of a target. Cheap to build, not remotely precise.

The modern version is a different animal. MasterPiece Arms builds a closed-bolt semi-automatic, and the lower receiver on the current MPA30T is machined from aluminum rather than stamped from steel. That means less weight, a more comfortable grip, and built-in features the old guns never had, including a QD flush cup for a single point sling.

Writing for GunMag Warehouse, a reviewer who owns the older guns called the modern MPA-30 "the finest iteration of the pistol ever produced".

What do hands-on reviewers say?

Worth being straight about something here. The most detailed published review of this platform covers the side-cocking MPA30SST, not the top-cocking MPA30T. Ben Philippi tested it for Guns.com against his own Cobray M11 and was blunt about the build quality: "It is much better made than my Cobray M11."

What carries over to the MPA30T: the aluminum lower receiver, the blowback action, the magazine, the general fit and finish, and the overall build quality. What does not carry over: his notes on the non-reciprocating handle and the top rail, both of which are side cocker features. Read that review for the platform, not for the controls.

MPA30T specifications

Listed by MasterPiece Arms:

• Caliber: 9mm Luger
• Action: semi-automatic, blowback
• Top cocking handle
• Muzzle thread: 1/2x28
• Adjustable front sight and adjustable rear sight
• Quick magazine release
• Aluminum lower receiver with QD flush cup for a single point sling
• Short Picatinny rail section under the front of the receiver for a light or laser
• One 30-round polymer magazine included
• Ships in a gun case
• American made, lifetime guarantee
• Non-threaded version available by special order

Retailer listings vary on barrel length between 4.5 and 5.5 inches depending on the production run, and published weights sit around 55 ounces. Come measure ours, or call and we will read you the numbers off the box.

What are the downsides?

We would rather you hear this from us than find out at the range.

• The cocking handle travels as you fire. Standard for the top cocking layout, but it dictates where your support hand goes.
• Mounting an optic is not straightforward. The scope mount is a side cocker feature. Ask before you buy an optic for this gun.
• The handle can be stiff out of the box. Reviewers of MAC-pattern MPA pistols report it loosens with use.
• The magazine is stiff to load. Reviewers of the sibling model could not hand-load a 30-round magazine past 20 rounds. A magazine loader solves this and is worth buying at the same time.
• The iron sights are basic. They are adjustable front and rear, which is better than the old guns, but they are still small.

None of these are dealbreakers if you know going in. All of them are worth knowing before you spend the money.

Can you engrave the MPA30T?

Yes, and it is a better canvas than most firearms. The lower receiver is machined aluminum, which takes laser engraving cleanly. Dark Horse Guns & Ammo does firearms laser engraving in-house in Yerington, so a pistol bought here can be marked here without shipping it anywhere. We confirm the artwork, size, and placement with you before anything is cut, because engraving does not come back off.

Frequently asked questions

Is the MasterPiece Arms MPA30T legal to own?

The MPA30T is a semi-automatic pistol and is legal in Nevada, subject to the same federal and state rules as any other handgun. MasterPiece Arms does not ship this model to California, Connecticut, Illinois, Washington, or Puerto Rico. Buyers should confirm the law where they live before purchasing.

Is the MPA30T full-auto?

No. The MPA30T is semi-automatic only, firing one round per trigger pull. It resembles a submachine gun in appearance, but it is a closed-bolt semi-automatic pistol.

Can I put a stock or a brace on an MPA30T?

Stop and ask us first. MasterPiece Arms does build a stock interface into the aluminum lower. That said, the MPA30T is legally a pistol, and attaching an actual rifle stock to a pistol with a short barrel creates a short-barreled rifle, which is a National Firearms Act item requiring ATF approval and a tax stamp before the parts are ever assembled. The rules covering pistol stabilizing braces have been through federal rulemaking and litigation in recent years and are not something to take on faith from a forum post. Talk to us at the counter and verify current federal law before you attach anything to the rear of that receiver.

Does the MPA30T come with a suppressor or a fake one?

Neither. The two we have in stock wear a knurled thread protector over the 1/2x28 muzzle threads, which is there to keep the threads clean. Some Defenders ship with a long barrel extension that looks like a suppressor. That part is a false muzzle: it adds weight and gives your support hand a place to hold, and it does nothing to the sound. An actual suppressor is an NFA item requiring ATF registration, approval, and a tax stamp, and these threads will accept one once you have been through that process.

What magazines does the MPA30T use?

It ships with one 30-round polymer magazine. These pistols have historically also run STEN pattern magazines, and the polymer magazines have often been TAPCO made. TAPCO is no longer in business, so if you like this gun, buying spare magazines sooner rather than later is sensible. Ask us what we can source.

How much does the MPA30T cost?

MasterPiece Arms lists the MPA30T at $540.00 on their own site, currently on backorder with a three to four week processing window. Call Dark Horse Guns & Ammo at (775) 344-8022 for our price on the two we have in stock.

Do I need an FFL transfer to buy one?

If you buy from Dark Horse Guns & Ammo in person, no transfer is needed. We are the federally licensed dealer, so you complete the paperwork at our counter and walk out with it, subject to the standard background check. If you buy a firearm online from someone else, it has to ship to an FFL, and we handle inbound transfers in Yerington.

Come see it

Two of these are on the shelf at Dark Horse Guns & Ammo, 518 W Goldfield Ave, Yerington, Nevada 89447. We are open Tuesday through Saturday, 10:00 AM to 5:00 PM, and closed Sunday and Monday. Call (775) 344-8022 or send us a message.

Come handle one. It is a strange, heavy, genuinely enjoyable pistol, and photographs tell you almost nothing about how it balances in your hands.

Dark Horse Guns & Ammo LLC is a federally licensed dealer in Yerington, Nevada. All firearm sales and transfers are subject to applicable federal and Nevada law, including background check requirements. Buyers are responsible for knowing the laws where they live. Nothing here is legal advice.