The Colt 9mm Submachine Gun is a lightweight, compact weapon encompassing the same straight line construction and design of the world renowned Colt M16 Rifle. This straight line construction, coupled with the low recoil associated with 9mm ammunition, provides highly accurate fire with less muzzle climb, especially in full
automatic fire. Less recoil also facilitates ease of training and improves accuracy. Like the M4 Carbine and Commando models, the Colt 9mm SMG fires from closed bolt, is equipped with a 4-position sliding buttstock and is readily field stripped without the need of special tools. Operation and training are similar to that of the M4 Carbine and M16 Rifle eliminating the need for substantial cross training.
The Colt 9mm SMG is blowback operated rather than the conventional direct impingement gas operation of the AR-15 series rifles, and it fires from a closed bolt.
The overall aesthetics are relatively similar to most AR-15 rifles. Changes include an enlarged brass deflector which replaces the standard AR-15 brass deflector. The magazine well of the receiver is modified using a special adaptor to allow the
usage of smaller 9mm magazines. Factory Colt 9mm SMGs are equipped with a 10.5 inch length barrel and M16A1 style upper receiver. The magazines are a copy of the Israeli UZI SMG magazine with a modified locking slot to fit the AR-15’s different magazine release button.
All Colt 9mm SMGs have an M16 style upper receiver, which means they feature a fixed carry handle with A1 sights and no forward assist. 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 inch (178 mm) barrel and simplified front sight post used by the DEA.
The latest version of the 635 is simply marked SMG 9mm NATO.
Exploiting the ergonomic similarity to the AR-15 and M16 families, the U.S. Drug Enforcement Administration, U.S. Marshal’s Special Operations Group and a number of other federal agencies have adopted the 635, as have several elite counter-terrorist and military special-operations units. A number of local law enforcement Special Weapons and Tactics (SWAT) use the 635 as an entry/close quarters battle weapon due to the 9mm Parabellum being safe against overpenetration, similar to the H&K MP5. The civilian-legal semi-automatic “carbine” version has found considerable favor in lieu of the shotgun with a growing number of police and sheriff’s departments around the country when range is not of concern, mainly in urban areas. 5.56mm carbines are still favored in patrol cars when shooting would occur at distances over 100 meters.
These Submachine guns are extensively used by the SWAT operated under the Dhaka Metropolitan Police (DMP)