I found the following model numbers whose description matches "carbine":
649 S.M.G. Sumachine gun. For US Air Force, with 14" (356 mm) barrel and 1 in 12" (1 in 305 mm) rifling. Property of US Gov't
GAU-5/A/A Cal 5.56mm
0000000
651 M16A1 carbine. Export model with 14.5" (368 mm) barrel and full size stock.
652 M16A1 carbine. Export model with 14.5" (368 mm) barrel and full size stock, but without forward assist.
653 M16A1 carbine. Export model with 14.5" (368 mm) barrel and sliding stock.
720 M4 carbine. Originally known as M16A2 carbine, with 14.5" (370 mm) barrel.
723 M16A2 carbine. Produced for United Arab Emirates and US Army Delta Force. With A16A1 rear sight, 14.5" (370 mm) barrel and full automatic fire capability.
725 M16A2 carbine. Canadian version of M16A2 carbine known as C8 with M16A1 rear sight and M16A2 barrel. License produced by Diemaco.
725A M16A2 carbine. Export version of the M16A2 carbine produced by Colt for United Arab Emirates with M16A1 barrel profile.
725B M16A2 carbine. Export version of M16A2 carbine with M16A2 barrel.
727 M16A2 carbine. Carbine with full automatic fire feature produced for (among others) the US Navy. With 14.5" (370 mm) barrel.
727 M4A1 carbine. Originally known as M16A3 carbine. Similar to Model 727 but with flat top rail under carrying handle. Fully automatic. In production for Joint DoD Special Forces.
I am also aware of the GAU-5/P carbines, which are the GAU-5/A/A's upgraded by armorers with the M4's 14.5" barrel.
Quoted:
Lump,
I'm nearly positive that the carbine pictured is a rubber duck.
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Tweak, I assume "rubber duck" means a molded-rubber stunt-gun. That looks like one of the Autoweapons.com product pictures. If the rifle barrel appears "bent" I think it's because of the lens distortion of such a close-range picture.