Sten MK3 SMG Vertical Vented Receiver Flat


Out of stock | Available: 24 weeks

Join the waitlist to be emailed when this product becomes available



Made from 16 Gauge mild steel (.0625”) to original specifications, this type of flats is what Enfield started out with during wartime manufacturing.

NO FFL or paperwork is required.

Ben Edwards Designs Product Catalog

Sten – Wikipedia






The STEN (or Sten gun) is a family of British submachine guns chambered in 9×19mm which were used extensively by British and Commonwealth forces throughout World War II and the Korean War. They had a simple design and very low production cost, making them effective insurgency weapons for resistance groups, and they continue to see usage to this day by irregular military forces. The Sten served as the basis for the Sterling submachine gun, which replaced the Sten in British service until the 1990s, when it, and all other submachine guns, were replaced by the SA80.

The Sten is a select fire, blowback-operated weapon which mounts its magazine on the left. Sten is an acronym, from the names of the weapon’s chief designers, Major Reginald V. Shepherd and Harold J. Turpin, and “En” for the Enfield factory. Over four million Stens in various versions were made in the 1940s, making it the second most produced submachine gun of the Second World War, after the Soviet PPSh-41.




The Mark III was the second most produced variant of the Sten submachine gun, manufactured in both Canada and the United Kingdom. The largest producer was Lines Bros Ltd. While the Mark III was made with fewer parts than the Mark II (48 compared to 69), the Mark II remained more popular due to logistical reasons as parts between the two were not interchangeable. Additionally, the Mark III had a fixed magazine well and a non-removable barrel, which made it necessary to scrap the entire weapon if the barrel was damaged.

The Mark III was also more prone to failure than the Mark II, which led to its production ceasing in September 1943. The receiver, ejection port, and barrel shroud of the Mark III were unified, leading them to extend further up the barrel compared to the Mark II. If captured by German forces, the Sten Mk III was designated MP 750(e). A total of 876,886 Mark III’s were produced.


Technical Information


Type Submachine gun
Place of origin United Kingdom
In service 1941–1960s (United Kingdom)
1941–present (Other countries)
Designer Major Reginald V. Shepherd
Harold J. Turpin
Designed 1940
Manufacturer Royal Small Arms Factory Enfield
ROF Fazakerley
ROF Maltby
ROF Theale
Lines Brothers Ltd
Long Branch Arsenal, Canada [a]
Various underground resistance group factories
Unit cost £2 6s in 1942
Produced 1941– (version dependent)
No. built 3.7–4.6 million (all variants, depending on source)
Variants Mk. I, II, IIS, III, IV, V, VI
Mass 3.2 kg (7.1 lb) (Mk. II)
Length 762 mm (30.0 in)
Barrel length 196 mm (7.7 in)
Cartridge 9×19mm Parabellum
Action Blowback-operated, open bolt
Rate of fire version dependent; ~500–600 round/min
Muzzle velocity 365 m/s (1,198 ft/s) 305 m/s (1,001 ft/s) (suppressed models)
Effective firing range 100 m
Feed system 32-round detachable box magazine
Sights fixed peep rear, post front



There are no reviews yet.

Be the first to review “Sten MK3 SMG Vertical Vented Receiver Flat”

Your email address will not be published. Required fields are marked *