The T65 is the basic full size assault rifle variant. It features the same sights as the M16, but lacks the carrying handle. The original T65 is the only version in the T65 family that fires the original 5.56x45mm M193 round. While the T65 was not fully satisfactory it was improved as the T65K1, which differed only in minor details.

The T65K2 incorporated many of the improvements of the M16A2. The T65K2 is also known as the T68. Externally it looks very much like the M16A2. It has a squared forearm and carrying handle. As with the M16A2 it uses the newer 5.56x45mm NATO round with associated faster rifling twist rate.

The T65K3 is a carbine variant of the T65K2 and later resulted in the T86. It looks similar to the T86, but can be identified by the solid handguard, slightly different sights and smooth pistol grip. It was meant as a prototype, but was taken into production as the T86

The T86 is a carbine version of the T65. The development took quite some time and relatively few were produced. It features a retractable stock similar to the one on the M4 and has a shorter barrel and handguard. The T86 differs internally from the T65K3 in having a modular gas piston, allowing for easy disassembly and maintainance.

The T91 was produced to replace all previous versions. The design is very similar to the T86. The T91 could be called a T86 with longer barrel and a flat top receiver with accessory rails. It has the same modular gas piston.