KISS

KISS is an acronym commonly used by those in the firearms modification and tactical industries. It stands for "Keep It Simple Stupid". An example of KISS used in a sentence would be - "Looking to build my next AR and I'm planning on using the KISS method for this build." - Basically, what the person who is planning on building his next AR is trying to say, is that he plans on building the most simple of AR's for this build. He will most likely use tried and true mil-spec parts and build a rifle that is very generic looking, but will function 110% of the time as this simplicity often results in enhanced reliability.