J-20-XS-Calibre Compatibility
17 / 221 / 223 Rem., 17 Fireball, 17 Mach 4, 204 Ruger, 218 Bee, 222 Rem. Mag., 300 AAC Blackout, 300 Sherwood, 300 Whisper, 32 Ideal, 32 Win. S. L., 350 Legend, 351 WSL, 6x47, 7.62 x 37 Musang, 6mm-223 Rem., 7.62x37 Musang, 810 Cadet.
J-20-M-Calibre Compatibility
219 Zipper, 20 / 22 / 24 Nosler, 22 BR, 22 Cheetah, 22 PPC, 22 Sav. HP, 22 Rem Jet, 220 Rus., 224 Valkyrie, 250 / 300 / 303 Sav., 30 / 35 Rem., 30 Rem. AR, 32-40 / 375 / 38-55 Win., 401 Win. S.L., 445 Super Mag., 450 Bushmaster, 460 S&W Mag., 5.6x52 Rimmed, 6.8mm Rem. Spl., 6mm BR-DX, 6mm Norma BR, 6mm PPC USA, 7.62x39 Rus., 7mm BR.
J-20-L-Calibre Compatibility
220 Swift, 224 Clark, 225 / 25-284 / 270 / 284 / 307 / 308 / 356 Win., 240 Wby. Mag., 25-06 / 244 / 280 / 6mm / 7mm-08mm Rem., 257 Roberts, 30-06 Spr., 30-30 Win., 30-40 Krag., 308 Marlin Exp., 360 Nitro Express 2 1/4”, 375 Rimless 2 1/4”, 32 Win. Spl., 338 Fed., 35 Whelen, 350 Legend, 376 Steyr, 444 Marlin, 400-375 Belterd Nitro Exp., 6.5 Carcano, 6 / 6.5 Creedmoor, 6.5x257 Roberts, 6.5-284 Lapua, 6.5x50 Jap. Arisaka, 6.5x52 Italian, 6.5x54mm Mann-Schoen, 6.5x55mm Swedish, 6.5-06 A-Square, 6.5-284 Norma, 6mm-284 Win., 7x57 / 7.65x53 / 9.3x57mm / 10.75x68 Mauser, 7x64 Brenneke, 7.5x55 Swiss, 7.7x58 Jap., 7-30 Waters, 7.35 Carcano, 7.5 Schmidt Rubin Swiss, 7.5x54 French MAS, 7.5x55 Swiss, 7.7x58 Jap., 7-30 Waters, 8x57J, 8mm-06, 9.3x74, 9.3x62, 9.5x57.