Caliber: 5.45 mm (5.45x39 forabove water firing and 5.45mm special underwater ammunition forsubmerged firing)
Action: Gas operated, rotating bolt
Overall length: n
Barrel length: n
Weight: kg
Rate of fire: ~600 rounds per minute
Magazine capacity: 30 rounds (for above waterconfig) or 26 rounds (for underwater config)
In mid-1970s, Soviet Navy adopted an underwater APS assault rifle for its combat divers, to provide underwater security against enemy frogmen and specially trained sea animals (i.e. dolphins). The APS, while successful in its narrow niche, had its set of inherent flaws, so, during the late 1990s,a severely modified version of it appeared in Tula, in the form of the experimental ASM-DT “dual medium” amphibious assault rifle.

The key improvement of the ASM-DT is that it uses a 5.45 mm rifled barrel with relatively shallow rifling, which allows to fire both standard 5.45 x 39 spin-stabilized ammunition, and modified underwater hydrodynamically stabilized ammunition, which is also based on 5.45 x39 case, with long projectile of about 5.4 mm in diameter. To achievethis, the magazine housing of the ASM-DT is fitted with a sliding magazine catch, which can be positioned at the rear of the long magazine port to hold the deep underwater magazines, or in the middle of the magazine port to hold the relatively shallow (front to back)AK-74 magazines. 

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