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Thanks for the help & information on the barrel replacement. Finally got the upper lapped and barrel installed. Used the vice block, no issues.
The new barrel was needed so the threads of the brake would extend out from under the handguard enough for my new Form 1 accessory. Perfect fit & testing went better than I imagined.

I ordered the Wheeler lapping kit as I can see the value in trueing up the mating surfaces. It should be here about the same time as the barrel & brake.
What about headspace? I read several forum posts and it seems the consensus is not too worry about it when using a new mil-spec AR barrel. Or is this something that must be done?

Thanks for the info. If I was planning to do this more often I would probably purchase one of the barrel spline tools. I had not considered barrel clamp in the vice, but I'm going to give that a shot. Now just waiting for the UPS truck for new 9" barrel and Q Cherry Bomb.

Also, I looked into bedding the barrel. Mostly see mixed results on doing this. Does it really make a difference? Would lapping be better, maybe for a precision gun?

I'm upgrading my 300Blk pistol with a new barrel and muzzle device and I have a question with the required tools. I have an upper receiver vice block (AIM Sports Inc AR Armorers Kit), armorers wrench, quality torque wrench, and Aeroshell 33. I've done quite a bit of research and watched several YouTube videos and most indicate this is all that is needed. Others say you risk damaging the upper receiver in using just the vice block instead of a reaction rod.

For those that have replaced barrels, what tools did you use? Any other gotchas?

Thanks.