Also feel free to fact check. I have not read all the sources yet.
| Weapon Model | Classification | Issue | Primary Ammo | Description | Sources & References |
|---|---|---|---|---|---|
| M39 | Tactical SMG | Standard Issue | 10mm Caseless | The current modular workhorse. Highly adaptable with rail systems for various optics and stocks; designed for urban stability. | M39 Submachine Gun |
| M39-U | Machine Pistol | Specialist Issue | 10mm Caseless | A cut-down “Ultra” variant of the M39 issued to Point-men and Recon for high-speed room clearing and one-handed use. | M39-U |
| X43 Barrage | Flechette SMG | Experimental | Meta-Darts | Officially commissioned for USCMC Recon/Intel. Uses razor-sharp, non-magnetic darts for specialized environment penetration. | X43 Barrage Flechette SMG |
| PPZ-49 Vol | Submachine Gun | 10mm Explosive | Known as the “Ox,” it features a closed-bolt, gasless system for superior grouping during sustained fire. Originally a UPP weapon, it was licensed for USCMC use via Hyperdyne. | PPZ-49 Vol | |
| NSG 23 | Assault Rifle | 7.62mm Caseless | A high-powered successor to the Weyland Storm Rifle. Featured higher stopping power than the M41A but saw limited USCMC use compared to the 3WE Royal Marines. | NSG23 Assault Rifle | |
| VP70 / VP78 | Machine Pistol | Standard Issue | 9mm / 10mm | Official service pistol; functions as a 3-round burst SMG only when the specialized shoulder-stock is attached. | VP78 Pistol |
| MP9 | Submachine Gun | Specialist Issue | 9x19mm Parabellum | Primary defensive arm for CommTech officers. Optimized for rapid deployment against light targets, though it lacks the armor-piercing capabilities of caseless systems. | MP9 Submachine Gun |
| LEM MP11 Stormsurge | Submachine Gun | 8.88mm Caseless | A bullpup SMG designed for urban combat. Features a high-control 5-round burst mode. Formally adopted by USCM units on Tientsin-class ships. | LEM MP11 Stormsurge | |
| 6A Jaipur | Submachine Gun | Bagh Nakh Sabot | A high-velocity SMG firing proprietary fractionating-sabot rounds. Each shot splinters into submunitions, making it devastating against unarmored targets. | 6A Jaipur Submachine Gun | |
| 8A7 Dambulla | Machine Pistol | 9mm Caseless | A compact, high-cyclic rate machine pistol. Features a top-loading magazine and is primarily issued to vehicle crews and pilots as a survival weapon. | 8A7 Dambulla Machine Pistol |