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Accuracy International AT-X

Mlok sucks. There seems to be no real standard on the fasteners. I bought an acc elite to put my vudoo in. Got the baker wings for shiggles and a set of gray ops weights ....had issues with the hardware on both accessories not wanting to lock up and chewing the cerakote up on the chassis. My AI ....Flawless with any of the accessories I have for it. No matter what the holes are shaped like, it works and the hardware is built like a tank.

Rebarreling an AR-15

I use and re-use parts as long as there isn't a reason not to. If I rebarrel and check headspace with the bolt I have. If it checks out, I continue running that bolt.

I do change the gas tube, if the round count on the existing one is unknown.

As for changing the barrel, are you changing it because you think it's shot out or because you're worried about your rig being good to go in the event of a SHTF scenario? In the former case, the barrel will tell you when it's shot out. In the latter case, I just keep a back up barrel for that. Actually, an upper with a barrel installed.