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sled I think they expect you to use use the spring already there….. But comparing the two carriers my Bushmaster e2s has a much lighter carrier. I checked the firing pin to see if it’s titanium, nope magnetic. This one has flutes on a 16 inch chromed barrel and shoots either 5.56 or .223. it has a pinned Russian muzzle brake. Overall I can’t decide if I’m not putting the new bcg in the wrong AR. I would get a different spring. Wolff sounds good. Maybe the test of the pudding is going out and trying it.