Take a good carbine course and see if your gimmicks are still working at the end of the day. If your "BAD" device is still working well for you after three days leave it in there, but you may prove the exception. The amount of stuff that gets taken off carbines (and pistols) during these courses is sometimes amazing. Sometimes at lunch the first day.

But I don't discount "stubborn" here. For example, there are still guys carrying Beretta M9/M92 pistols (and fumbling with the slide safety and 10 pound DA trigger) after a 3-day pistol course even though grandmothers have been out-handling and out-shooting them with Glocks and M&Ps for 2-1/2 days.

KISS (Keep It Simple, Stupid).

-- Chuck