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Amazing item to upgrade your gun. I installed this in my Echo 1 M4, and it increased my accuracy quite a bit. Please note that if you are upgrading your inner-barrel, you should replace at least the bucking on the barrel as well. I did a cylinder tune-up, and an M120 spring at the same time. Accuracy and range went through the roof. I installed the 60 degree bucking (Mad Bull I believe). Everything I purchased you can get on Evike too! Went from hanging with the big boys at the local field, to being the top dawg.
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