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"This is pretty hot ammo, it pushes an 88gr bullet at ~ 1160fps from a Mak-length bbl" did you get these numbers from a chrono or are these factory supplied numbers? If you've already put 1,000 rounds thru the gun with no problems then I wouldn't worry about it. If I was concerned about wear I'd used a 21# spring instead of the 19# spring.
 
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