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AR-10 build

5K views 17 replies 11 participants last post by  dickpalmer 
kytowboater said:
Get an upper chambered in 7.62x51, then you can shoot both the 7.62 and .308 rounds. Both seem plentiful.
Isn't the .308 a higher pressure round than the 7.62 meaning you should buy the .308 in order to shoot both? I could be wrong but I thought I read this somewhere just making sure
 
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