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