The Colt 9mm SMG
is a 9x19mm Parabellum submachine gun
manufactured by Colt
, based on the M16 rifle
The Colt 9mm SMG is a closed bolt, blowback
operated SMG, rather than the conventional direct impingement gas operation
of the standard 5.56x45mm M16 type rifle.
The overall aesthetics are identical to most M16 type rifles. Changes include a large plastic brass deflector mounted toward the rear of the dust cover. 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.
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 barrel and simplified front sight post used by the DEA.
The most common model is the 635, the latest version of which are simply marked SMG 9mm NATO
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