Are you Keats on AS? What Hangtight said over there is good advice. For the spring, you'll only need to cut it if you need to drop FPS. Guarder springs are currently considered some of the best. Go with the ZCI, the SHS isn't the best choice for a DMR. The G&G is a great bucking, definitely better than the Lonex 70d(currently getting ~175' effective range with a Lonex and .28's).