The first version called the Rk 60 was produced in 1960 and was internally almost an copy of the AK-47. It featured a metallic buttstock, a plastic handguard and pistol grip. After testing by the military, it was slightly modified and adapted as the Rk 62.
Different version of the weapon include the Rk 76, which is a version with a stamped steel receiver that reduces the weight to 3,5 kg. The latest version is called Rk 95TP and it has a folding stock. It is currently used by the Finnish Army in small numbers.