MP40

The Original MP40: History and Legacy

The MP40 (Maschinenpistole 40) was a German submachine gun developed in 1940 that became one of the most produced and recognizable firearms of World War II, with over one million units manufactured. Chambered in 9mm Parabellum, it used a simple blowback operating system with a folding metal stock, making it compact and easy to produce. The MP40 was widely issued to German paratroopers, officers, and vehicle crews and saw service on every front of the war. Its distinctive folding stock, ribbed magazine housing, and smooth lines make it one of the most identifiable military firearms in history, and it has appeared in virtually every WWII film and video game set in the European theater.

Semi-Auto MP40 Replicas and Descendants

Several American manufacturers have produced semi-automatic pistols and carbines that draw on MP40 heritage in aesthetics and operating principle. Masterpiece Arms produces their MAC-style 9mm pistols and carbines — open-bolt-inspired semi-auto blowback designs that share the compact, high-capacity character of the MP40 family. The MPA930SST and similar models offer the blowback 9mm action in a compact format that accepts high-capacity magazines. For buyers specifically interested in MP40-aesthetic replicas, manufacturers including American Tactical and others have produced semi-auto pistols styled after the original German design with period-correct furniture and controls adapted for modern semi-automatic operation.

Masterpiece Arms MAC-Style Pistols: The Modern Descendant

Masterpiece Arms (MPA) is the primary current manufacturer in the MAC/MP40 lineage for the American market, producing 9mm and .45 ACP semi-auto pistols and carbines. Their MPA930 series features a side-cocking blowback action, threaded barrel options for suppressor use, and compatibility with high-capacity magazines. The compact size, simple blowback operation, and proven MPA build quality have made them popular for suppressed use — the blowback action pairs well with 9mm suppressor hosts because the simple operating system does not require the adjustments that gas-operated platforms sometimes need when adding a suppressor. MPA pistols are also used in competition classes that allow open configurations.

Blowback Operation: What It Means for MP40-Style Firearms

All MP40-derived semi-automatic firearms use simple blowback operation — the bolt is held closed only by the weight of the bolt assembly and the recoil spring, without any locking mechanism. When fired, propellant gas pressure pushes the case rearward against the bolt face, cycling the action. Blowback is reliable, simple to maintain, and produces a distinctive recoil impulse that pushes straight back rather than cycling through a rotating or tilting mechanism. The tradeoff is that blowback pistols are typically heavier than comparable locked-breech designs because a heavier bolt is needed to delay opening long enough for pressure to drop to safe levels. For 9mm — a relatively low-pressure pistol cartridge — blowback is entirely practical and produces no reliability penalty.

Collector Value and Military Surplus

Original WWII-production MP40 submachine guns are regulated as NFA items (machine guns manufactured before 1986 are transferable to civilians in most states) and command very high prices in the collector market. Semi-automatic replicas and descendants scratch the aesthetic itch without the NFA paperwork and cost. For collectors who want an original MP40 as a display piece, deactivated examples are available; for shooters who want to run a 9mm blowback platform in the MP40 tradition, the Masterpiece Arms lineup is the practical choice.

Frequently Asked Questions: MP40

Is the MP40 legal to own?
Original full-auto MP40 submachine guns manufactured before 1986 are NFA-regulated machine guns that are legal to own with proper NFA registration and tax payment in most states. Semi-automatic replicas and descendants like Masterpiece Arms pistols are standard semi-auto firearms with no NFA requirements.

What caliber is the MP40?
The original MP40 and all modern semi-auto descendants are chambered in 9mm Parabellum (9mm Luger).

What is Masterpiece Arms?
Masterpiece Arms (MPA) is an American manufacturer based in Comer, Georgia, producing MAC-style 9mm and .45 ACP semi-automatic pistols and carbines. They are the primary current-production manufacturer in the American MAC/MP40 blowback pistol lineage.

Are MP40-style pistols good for suppressed use?
Yes. The simple blowback action of MP40-style and Masterpiece Arms pistols makes them excellent suppressor hosts. The action does not require adjustment for suppressed use, and the closed-bolt semi-auto operation keeps gas blowback manageable with a suppressor attached.

Browse MP40 and MAC-Style Pistols
Shop MP40 descendants and Masterpiece Arms pistols at Impact Guns — we ship nationwide.

See Also: Masterpiece Arms • Pistol Caliber Carbines • Suppressors & NFA • 9mm Ammo