The LAPA FA-03 assault rifle is a gas operated weapon that uses conventional piston-operated system with rotating bolt locking. The most unusual thing about FA-03 is its trigger, which can be set to "double action" mode, in which rifle can be carried safely with loaded chamber and hammer in lowered position, safety disengaged. In this mode, rifle is ready to fire but it requires along and deliberate trigger pull to fire the first round (a system very popular in modern semi-automatic pistols).
The LAPA FA-03 uses a conventional gas-operated system with rotating bolt locking. It is chambered for the 5.56 x 45 mm standard NATO round. This rifle has an unusual trigger, that has a single- and double-action modes. Rifle can be carried safely with the round loaded and is ready to fire at any time. Similar system is very popular in modern semi-automatic pistols.
IMBEL MD-97 rifles feature gas operated action with short-stroke piston and rotary bolt locking. The trigger unit and folding or fixed buttstock are same as on earlier 7,62mm Fz MD963 rifles (Brazilian-made copies of Belgian FN FAL rifle).Both rifle and police carbine variants are available with either fixed or folding buttstocks; the military MD-97L also can be fitted with domestically-made 40mm underbarrel grenade launcher or bayonet. MD-97 rifles use M16-compatible magazines.