Sounds good - Buy the gun first and run it to make sure it works. That's step one.
Next step, IF it FTE, what next? Send it back? What would I try to do to fix the FTE? Is that what the reliability kit is for? Even if it runs right, could it hurt to use it?
Next, nix the rock n lock. Got it.
Then, for 922 compliance, does my buttstock (TBD), pistol grip, forearm (Chaos Titan), Mag body, follower and floorplate count for 922? (thinking like a US made drum).
After that, I think I'm good to go?