// Firearms · M4 DI
M4 DI Series
Our small-frame AR on the SOTM4 platform, running direct impingement — the SOTM4 Billet and SOTM4 Forged rifles and pistols, the SOT SPIRE 6, and the home of the SOTM4 Monobloc, our gold standard for bombproof design.
// Models
Model line-up coming soon
Models, specifications and pricing for the M4 DI Series are being finalized and will be published here.
- 5.56 NATO
- .223 Wylde
- 6.8 SPC II
- 6mm ARC
- 6mm MAX
Why choose it
- HM Defense Monobloc® barrel with the gas block machined in — nothing to shift or work loose
- HM Defense HMB™ bolt in an SOT Enhanced bolt carrier group
- Billet receivers, or the SOTM4 MOD-0 forged upper thermal fitted to the barrel
- Carbine and VLTOR A5 configurations; Monobloc pistols in 14.5″, 13.9″ and 12.5″
- SOT SPIRE 6 rifles in 6mm ARC and 6mm MAX, and the SPIRE 6 Pistol in 6mm MAX
// Questions
Talk to us about this series
Tell us what you need and we will help you choose the right configuration.
Monobloc® and HMB™ are marks of HM Defense, LLC, used under license. Other product names are marks of their respective owners.
Bombproof by Design™
Precision // Purpose // Performance