The StubbMaschinenpistole-40 (SMp40) is a 9mm SMG derived from the iconic and infamous MP40 submachinegun. The SMp40 is a nearly 1:1 copy of the MP40 externally and is a functional firearm that can be built with commercially available parts instead of wasting very scarce and valuable originals. Perfect for collectors, enthusiasts, re-enactors and enactors alike, the SMp40 can be built for several purposes, and can be customized easily with 9mm AR15 platform parts for caliber conversions. The SMp40 can be built as a pistol, rifle or SBR and feeds from common Colt SMG UZI pattern magazines.

Future variants and DLC are projected to include:
-SMp38 (Early released for backers)
-SMp41 (Early released for beta testers)
-Sten magazine well (In trials now)
-SMp40/I (In prototyping now)

Recommended vendors:

• OnlineMetals.com : Tor this project and more, a genuine subsidiary of Krupp and the best place to get your metal tube

• ursa-sec.com : The place to find properly made Super Safeties in Hoffman's original style. (Pending change to Ursa-Sec.Org due to issues with web host)

• 3dprintfreedom.com : A long term supporter who offers parts kits of all non-printed parts for many 3d printable designs including this one
  If using the 3DPF safety use this push button located on their Odysee. https://odysee.com/@3dprintfreedom:6/smp40_machined_charging_handle_safety:4

Additional thanks to:

• Black Lotus Coalition : Host for the beta testing of the SMp40 and many more interesting designs.

Revision: As of 23 October 2025 the receiver tube cover charging handle slot has been moved further forward. The original beta version mistakenly included was further back and this did not work with extended length buffer weights. The cut template was already the further forward version. Ideally for use with extended buffer weights the slot should roughly align with the letter M on the lower side of the cover that is covered by the furniture, and the version with the slot further back aligned with the zero requires a bolt carrier group with an internal weight.

LBRY Tags: mp40; smp40; smg; stubbs; 9mm