AR builders I need your help.

MAGNUM FORCE

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G2g. Same bolt head/bolt face. Chamber is cut into the barrel, not the bolt and will be headspaced there. Unless something is out of spec, your headspace will be good to go
Thanks man. I can't find ammo for my 243 but I got about 5000 rounds of 308 so I'm thinking about getting a 308 upper instead of the 243 upper.
 

MAGNUM FORCE

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Personally, I'd just swap barrels. Keep the 243 barrel if dead set on running 243 someday, but I'd just sell the 243 barrel given your 308 stash
I would but I don't like the hand guard on the 243 upper and I'd prefer an Aero upper to match perfectly with the aero lower. I'm keeping the complete 243 upper for the 86 rounds of 243 I have left. In case I ever need it for some end of the world reason.
 
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