thanks man. the mod 2 upper runs great and seems very accurate , the mini 4 does a great job for it's size. i was able to take it out again yesterday to try some different buffers and springs. it seemed to like a green spring and an a5h4 buffer the best although i only had an a5h2 and a5h4 with me. i think i may pick up an a5h3 to try the next time out.
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