The GRAM 63 was a Swedish prototype battle rifle developed in the early 1960s to replace the aging semi-automatic Ag m/42 rifle. Chambered for 7.62×51 mm NATO, it featured a gas-operated action with a detachable 20-round magazine and conventional iron sights. The design was part of a series of trials in the late Cold War era to adopt a modern select-fire infantry rifle that could match contemporaries in NATO armies, clearly it didn't win.
It lost out to the G3 which is then named the AK-4.
The battle rifle takes "FAL" magazines and also has a hidden picatinny rail at the top and bottom, as well as accepting muzzle devices; The rifle does take cues from the FAL so some of the handling was said to be similar. Plus folding stock!
Model from aeternal11 (SketchFab)