Recent research has indicated that the Mossberg models #930 and #935 have been frequently cited for recurring mechanical problems.

1.) Failure To Eject(FTE) - This is often caused by excessive carbon buildup on the gas piston.

2.) Ammunition Sensitivity - Some owners report that the gas system does not reliably cycle lower-powered ammunition.

3.) Component Failure - For heavy users, small parts like extractors and charging handles have been known to break down over time.

Two of the most widely known parts to fail are the gas piston assembly and the gas piston seal. Unfortunately, when either of these parts fail

their replacement parts are almost non-existent.