Ruger American Rimfire Standard, Bolt-Action Rifle, 22LR, 18 Satin Stainless Threaded Barrel, 1/2 x 28 Thread Pitch, Black Composite Stock, 10Rd, Scope Base, Flush Mounted Rotary Magazine 08351 Each Ruger American Rimfire(R) rifle includes two interchangeable stock modules that provide comb height options for scope or iron sight use (excludes wood and laminate stock models). Standard models come with long length of pull modules, while compact models come with short length of pull modules.