Colt 9mm SMG

"M635" redirects here. For BMW M6/M635CSi, see BMW E24 § M version.
Colt 9mm SMG

The Colt 9mm SMG
Type Submachine gun
Place of origin  United States
Service history
Used by See Users
Wars Miami Drug Wars[1]
Production history
Produced 1982–present
Weight 2.61 kg (5.75 lb) w/o magazine[2]

730 mm (28.9 in ) (stock extended)[2]

650 mm (25.6 in) (stock retracted)[2]
Barrel length 10.5 in[2]

Cartridge 9×19mm Parabellum[2]
Action blowback, closed bolt[2]
Rate of fire 700-1000 round/min[3]
Muzzle velocity 396 m/s (1300) ft/s)[3]
Effective firing range 100 m[2]
Feed system 20- and 32-round detachable box magazine[3]

The Colt 9mm SMG is a 9×19mm Parabellum submachine gun manufactured by Colt, based on the M16 rifle platform.[4]

Design details

The Colt 9mm SMG is a closed bolt, blowback operated SMG, rather than the conventional direct impingement gas operation of the standard 5.56×45mm M16 type rifle.[5] As a closed bolt weapon, the Colt SMG is inherently more accurate than open bolt weapons such as the Israeli UZI.[6]

The overall aesthetics are identical to most M16 type rifles. Changes include a large plastic brass deflector mounted toward the rear of the ejection port. Factory Colt 9mm SMGs are equipped with a 10.5 inch length barrel and have an M16 style upper receiver, which means they feature a fixed carry handle, no forward assist and A1 sights (with 50 and 100 meter settings). The magazine well of the receiver is modified using a special adaptor to allow the usage of smaller 9mm magazines. The magazines themselves are a copy of the Israeli UZI SMG magazine, modified to fit the Colt and lock the bolt back after the last shot.[7]


For more details on Colt 9mm SMG variants, see AR-15 variants.

Current Colt production models are the RO635 which features a Safe/Semi/Full Auto selective fire trigger group and the RO639 which features a Safe/Semi/3-round Burst selective fire trigger group. Both are equipped with a 10.5 inch length barrel. The 633 was a modified compact version with a 7 inches (180 mm) barrel, hydraulic buffer and simplified front sight post used by the DEA.[8][9]

The most common model is the 635, the latest version of which are simply marked SMG 9mm NATO.[10]


Argentine soldier armed with Colt 9mm SMG


  1. "War on Drugs". Retrieved 2016-11-07.
  2. 1 2 3 4 5 6 7 Colt Military Catalog
  3. 1 2 3 Colt Law Enforcement Catalog
  4. "Colt Weapon Systems". 2003-05-18. Archived from the original on 2003-05-18. Retrieved 2016-11-07.
  5. Tarr, James (2013). Standard Catalog of Colt Firearms. Iola, Wisconsin: Krause Publications. p. 237. ISBN 978-1-4402-3747-8. Retrieved 31 August 2016.
  6. Technical Memorandum 2-79. AIMING POINT DISPLACEMENT FROM FIRING A RIFLE FROM THE OPEN-BOLT POSITION. by Dominick J. Giordano I. February 1979. U.S. Army Human Engineering Laboratory 1, U. S. ARMY HUMAN ENGINEERING LABORATORY, Aberdeen Proving Ground, Maryland 21005
  7. Thompson, Leroy (19 May 2016). The M3 "Grease Gun". Bloomsbury Publishing. pp. 141–142. ISBN 978-1-4728-1109-7.
  8. Peterson, Philip (2011). Standard Catalog of Military Firearms: The Collector's Price and Reference Guide. Iola, Wisconsin: F+W Media. p. 387. ISBN 978-1-4402-2881-0.
  9. Sweeney, Patrick (18 January 2016). Gun Digest Book of Suppressors. Iola, Wisconsin: F+W Media, Inc. p. 45. ISBN 978-1-4402-4532-9.
  10. Lewis, Jack (2011). "A Case of Colt Confusion". Assault Weapons. Iola, Wisconsin: Gun Digest Books. pp. 208–210. ISBN 1-4402-2400-5.
  11. "Algunas armas utilizadas por el actual Ejército Argentino". Aquellas armas de guerra. Retrieved 15 November 2014.
  12. "Dhaka Metropolitan Police SWAT - Overview". bdmilitary. Retrieved 22 February 2009.
  13. "Sabitha's day out with latest weapons of Octopus". The New Indian Express. Retrieved 2016-11-07.
  14. "PALSAR Golani operator posing with a Colt 9mm SMG. The weapon is fitted with a sound suppressor and a forward grip.". Retrieved 2016-11-21.
  15. "PASKAU Malaysian Special Air Service Weapons". Military Factory. Retrieved April 14, 2016.
  16. "Archived copy" (PDF). Archived from the original (PDF) on 2009-01-10. Retrieved 2014-06-11.
  17. "Modern Firearms". Retrieved 15 November 2014.
  18. "Chuck Taylor's ASAA -THE COLT M635 9mm SUBMACHINE GUN". Retrieved 15 November 2014.
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