You've probably heard this question alot before, but I had a few questions about things that are mentioned here alot. I know alot, but not as much as the other guy... I'm learning everyday, so here is it... Whats the $.25 Trigger Polish Job? Whats the OEM Barrel? (Original Equipment Manufacturer?) What does a 6 lb trigger spring do? (Does is aid for a smoother trigger pull such as the 4lb Striker spring combo'ed with the 3.5 Connector?) Thanks !