Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Pay Scale Military Ranks


Star Model Si35

Submachine Gun (SMG) (1935)

Infantry Small Arms / The Warfighter

Jump-to: Specifications

Its inherent complexity doomed the Spanish Star Si35 submachine gun series - rejected by both the United States and Britain in the pre-World War 2 period.

Authored By: Staff Writer | Last Edited: 05/03/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
The Spanish-originated Star Si35 became a very conventional submachine gun offering of the interwar period (that is the period spanning the two World Wars). A delayed blowback action was used and full-automatic fire was standard (though a selector managed rate-of-fire between 300 and 700 rpm settings and a "hold-open" feature quickly indicated an emptied weapon). The weapon was chambered for the local Spanish 9x23mm Largo ("Long") cartridge and could by fed by way of a 10-, 30- or 40-round detachable straight magazines inserted into the underside of the receiver. A wooden stock made up the shoulder support, grip handle and under-receiver sections while the barrel, receiver itself, and magazine were all completed in metal. Iron sights were affixed at the receiver and near the barrel in the usual way. Manufacture was by Star Bonifacio Echeverria.

The Si35 represented something of a culmination of sorts for the Star company as the it had delved into a variety of submachine gun designs leading up to World War 2 (1939-1945). It interested few in its progressions despite appearing as rather useful submachine gun entries. The weapon was indeed trialled by the United States (in modified form as the Star "Atlantic") and Britain but both parties elected for designs of local origination. One of the major drawbacks of the series seemed to be its internal makeup which was deemed too complicated for wartime production and wide scale procurement by a large army service. Such high-profile rejection did not bode well for wide-acceptance of this Spanish firearm.

To that end, the Si35 gradually fell out of any favor it had attained - though it managed to see some combat service in the waning stages of the Spanish Civil War (1936-1939) before its history was fully written. By 1942, the Star company had moved on simply copying popular German Army submachine models like the MP38/MP40 family of guns - these being detailed elsewhere on this site.


Service Year

Spain national flag graphic


Submachine Gun (SMG)

Echeverria SA - Spain
National flag of Spain Spain
(OPERATORS list includes past, present, and future operators when applicable)

Overall Length
900 mm
35.43 in
Barrel Length
269 mm
10.59 in
Empty Wgt
8.25 lb
3.74 kg

Iron front and rear.


Delayed Blowback; Full-Automatic; RPM Selector

Rounds are automatically ejected from the breech, a new cartridge stripped from the feed and set in the chamber, and rounds are continuously fired so long as the trigger is pulled and an ammunition supply exists.
Blowback Operation
Gas pressure from the rearward movement of the ignited cartridge case provides the needed bolt movement, ejecting the spent case and stripping a fresh case from the magazine.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


9x23mm Largo

Rounds / Feed

10-, 30- or 40-round detachable box magazine
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Muzzle Velocity
1,350 ft/sec
(411 m/sec)

Si35 - Base Series Designation
Star "Atlantic" - Variant offered to the U.S. Army in 1940.

Military lapel ribbon for the American Civil War
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Cold War
Military lapel ribbon for the Falklands War
Military lapel ribbon for the Korean War
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the Vietnam War
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2

Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns / operations.


Disclaimer | Privacy Policy | Cookies

2022 Military Pay Scale Army Ranks Navy Ranks Air Force Ranks Alphabet Code DoD Dictionary American War Deaths French Military Victories Vietnam War Casualties

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, WDMMA.org, the World Directory of Modern Military Aircraft, and SR71blackbird.org, detailing the history of the world's most iconic spyplane.

Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-