Ultimate Arms Gear Ruger SR22 SR-22 10.4" Top Picatinny Full Size Long Aluminum Rail Wave Cut Style + 3" Side Rail Combo Set 1 Full-Size 10.4" Top Rail + 3" Side Rail. Rail Type: Picatinny / Weaver. Top Rail See Through Design. Style: Wave Cut. Material: Aluminum Short Side Rail are 3" with 7 Slots.