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I'd be more apt to stock up on replacement parts kits - Sportsman's has CMMG spring/detent kits for $14 - includes all the springs in the lower, plus detents to go with. Maybe add a couple spare complete bolt carrier groups, a castle nut wrench, and whatever tool you need to work on the front end of the rifle and call it good. Unless you shoot a crap ton of ammo - you'll likely wear out a barrel. If you do - good on you. I think. You're probably a hell of a shot after all that practice.
Let us just say I am not lacking in spare parts either. I have been doing this for some time and I like to put them together like puzzles.
I have enough parts to build the 3 stripped lowers in the picture with spares to boot. The two things I love building/fixing up are ARs and Motorcycles and my wife will not let me bring the bikes in the house to work on in the winter so its ARs