Im looking to find a way to reduce the trigger pull on my bushmaster AR. Im guessing the only or best way to do this is to go with a drop in trigger of some sort. What are these all about and am i looking in the right direction for getting a faster rate of fire? If the drop in trigger is the way to go what is the best bang for your buck? Also, Ive seen or heard of two stage triggers. What does that mean. Thanks.