Ok, I have a DDM4 V7, a LMT and just got a KAC Sr15 Mod 2. Question is does anyone standardize their AR's meaning just have multiple rifles that are all the same? I'm thinking of going all KAC SR15's. I know lots of parts are inter changeable but was thinking of making sure everything was that way. I love my AR's but mainly shoot my bolt guns. Thoughts?