As Sweden was looking to adopt a new self-loading infantry rifle in the 1950s, one of the contenders was a modernized version of the Ljungman. The Fm/57 is one of the last iterations of that project. It is chambered for 6.5x55mm but uses the short-stroke gas piston conversion that we previously saw on the 7.62mm NATO conversions of the Ljungman. It also uses a more refined lower receiver than its Fm/54 predecessor, with a nose-in-rock-back 20 round magazine and a folding stock. It was entered into formal trials against the GRAM-63 (another domestic Swedish design), the M14, G3, SIG 510, FAL, and AR10...which it lost.