LMT CSW
Lewis Machine & Tool Company · Carbine · In Production · 2017
Also known as: Confined Space Weapon, LMT CSW SURG
Overview
The LMT CSW (Confined Space Weapon) is an integrally suppressed select-fire carbine developed by Lewis Machine & Tool as the company's entry into the U.S. SOCOM Suppressed Upper Receiver Group (SURG) program. Built around an ambidextrous MARS-L PDW lower and a direct-impingement monolithic upper, it pairs a quick-change barrel with a full-length integral suppressor employing LMT's Virtual Baffle System, so the muzzle signature stays buried under a single full-length handguard. Originally shown in .300 Blackout, it was adapted to 5.56x45mm NATO for the SURG requirement and is intended for vehicle entry, naval boarding, and close-quarters work in confined spaces.
Specifications
| Weight (empty) | 3175 g (112.0 oz) |
| Overall Length | 610 mm (24.02") |
| Barrel Length | 298 mm (11.73") |
| Action Type | Gas Operated |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Action |
| Magazine Capacity | 30 rounds |
| Magazine Type | Detachable Box |
| Effective Range | 200 m (219 yd) |
| Rate of Fire | 800 rpm |
| Barrel Rifling | Right Hand |
| Rifling Twist | 178 mm (7.01") |
| Frame Material | Aluminum Alloy |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Matte Black |
Calibers
- 5.56x45mm NATO · primary · 5.56mm NATO — also known as .223 Remington, 5.56x45mm, SS109, M855
Features
- Firing modes: Semi Automatic, Full Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety, Ambidextrous Safety Selector
- Features: Integrally Suppressed, Monolithic Upper Receiver, Monolithic Rail Platform, Quick Change Barrel, Ambidextrous Controls, M-Lok Handguard, Collapsible Stock, Backup Iron Sights
Production
Production years: 2017-present
Low-volume specialty platform; produced for SOCOM SURG trials, military/law enforcement, and a limited civilian semi-automatic version
Origin
Country of origin: United States
Designer: Lewis Machine & Tool Company
Notes
LMT competed for the SOCOM SURG contract, which was ultimately awarded to SIG Sauer in 2019. The CSW was publicly shown at Poland's MSPO 2018 exposition. The .300 Blackout configuration uses a 10.5-inch integrally suppressed barrel; the 5.56 SURG configuration uses a longer integrally suppressed barrel assembly. A semi-automatic civilian version has also been offered.
Background
Developed alongside suppressor technology licensed from Lawrence Livermore National Laboratory through the U.S. Army's ARDEC, the CSW was conceived for operators who must fight inside vehicles, ships, and rooms where a conventional muzzle blast is intolerable.