That sounds like your buffer. Those can be purchased and replaced.
Unless you're like me... I recently purchased two of them and almost as quickly set them down and promptly lost them.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.