R.T.I. tried to develop its manufacturing capability for the semi-auto Piranha Recoilless Pistol, utilizing hesitation lock bi-angular springs to reduce 85% of the recoil, and which also allowed changing calibers by changing the barrel.
Previous trademark of a recoilless semi-auto 9mm Para. cal. pistol that was advertised circa 1996, but never manufactured by Recoilless Tech, Inc. located in Glendale and Phoenix, AZ. While advertised, Piranha pistols were never manufactured (except a few prototypes).

PIRANHA Firearms Models