You said detachable magazine. Yes the floor plates on the remington bdls are metal but many of today's cheaper budget rifles have detachable magazines that are made of primary plastic. I have a ruger american and the magazine is properly 95 percent plastic. Also you don't have the chance of missplacing or breaking the detachable magazine. Had some remington 541/581 mags that simple unloaded themselves when fully loaded because the cheap plastic separated. Remington replaced.