Well, it would help to know which gun your model 512 is, but for now I will assume it is a Remington SportsMaster 512. The bolt stop may be worn, broken or dirty. Take it to a gunsmith for examination and repair as needed. Parts wear out.
You do not put "gas" in a Desert Eagle...gas operated means the slide is operated via the escaping gas of the catridge that was just fired - forcing the slide back, ejecting the spent round, slide will come forward due to the recoil spring and a new round will be chambered.
the Springfield rifles fired round bullets or bucks.
Lexington, Massachusetts.
Lexington, Massachusetts.
No.
500 USD
Concord Massachusetts
No. different cartridge
Type of rifling/twist.
A pistol which automatically loads the next round into the chamber for firing after the previous round is fired.
A bullet
A round is loaded into a gun. The gun is then cocked and then fired.