I just bought the upper to complete the build I began about two weeks ago, It is an LMT defender 2000 lower with ergo grip and standard telescoping stock, w LE markings, standard trigger, the upper is a lmt 16in standard upper with plain jane m4 hand guards and fa auto BCG. With LMT and buying an upper and lower seperatly or in general how much play should be between upper and lower, and is seeing daylight between upper and lower a problem. It is very little play maybe a few centimeters, maybe Im nitpicking, well tell me what you think, and is a case of m193 for 200 dollars a good price to feed this thing(500 rounds)?BUIS are on the way a yankee hill flip up from bravo company are they any good? well thats enough from me tell me what you think?