BudsGunShop.com - RUGER PC9 carbine compatibility

Yes. The new PC Carbine accepts magazines from three current Ruger pistol lines: the SR Series and Security-9—which, curiously, are not interchangeable between their host pistols—and the American.

yes it is compatible from the ruger web site "Factory Magazine is compatible with the Security-9® pistol and the PC Carbine™ with the SR9®/Security-9® Magazine Well Insert installed."