Even before the AT4 had been adopted by Sweden, it was entered into a US Army competition for a new anti-tank weapon mandated by Congress in 1982 when the FGR-17 Viper failed as a replacement for the M72 LAW.
Čak i prije nego je Švedska usvojila AT4, ušao je u konkurenciju američke vojske za novo protu-tenkovsko oružje ovlašteno od strane Kongresa u 1982., kada se FGR-17 nije pokazao uspješnim za zamjenu M72 LAW-a.