shooting when outside of water, the barrel is rifled, however it has shallow grooves running along its length, which expel some gases ahead of the bullet and blow any water out of the barrel. This prevents the barrel from bursting if the rifle should need to be taken to the surface quickly, and fired outside of water without being drained first. In addition, the rifle can be equipped with a GP-25 grenade launcher, a bayonet, or a PBS sound and flash suppressor. Additional accessories include: flame arrestor, a blank firing device for low-noise shooting (UPMS), various types of optical and night sights, and tactical lights. The rifle has a folding stock, which, along with the pistol grip and handguard, are made of impact resistant plastic. The combat effectiveness of ASM-DT is comparable with the AK-74 and APS when fired in air and water environments, respectively. The Russian Federation accepted the ASM-DT into service in the year 2000. See APS amphibious rifle for considerations involving shooting power underwater. See also Bibliography Leszek Erenfeicht, Rosyjska broń strzelecka dla płetwonurków, Strzał 5/2003. ISSN 1644-4906 Modern Firearms - ASM-DT Morskoj Lev (Sea Lion) dual medium (underwater and above water) assault rifle External links Modern Firearms - ASM-DT Morskoj Lev (Sea Lion) dual medium (underwater and above water) assault rifle Assault rifles of Russia Underwater rifles Russian inventions Tula Arms Plant products Military equipment introduced in the 1990s