Sako TRG 22/42 ACT Picatinny Rail Adaptor (225 mm Long), 21mm height S151W231. This rail is an accessory Picantinny adapter for Sako TRG, compatible with USA Mil-Std 1913. By installing this adapter on the top of the Sako TRG action, on the rifle can be used scope muounts built for the Picantinny rail.