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when you use a 7.62x39 upper on a std 5.56 carbine lower should you or do you need to use a heavier buffer because of the heavier charged load? i tried to put a 4 oz buffer in my .223 upper and it didn't feed right so i put the 3 oz weight back in and all was good so just wondering if the 4 oz buffer might be needed if i try the 7.62x39 upper ...........thanks in advance ......ed
 

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You shouldn't need to, mine is a standard A2 buffer and spring. I've been using my 7.62x39 AR for over a year with the only problems being finding decent magazines that feed well so if you have any other questions let me know. If you're not far from middletown and have a place to shoot I'd be willing to let you try my upper on your lower in exchange for some range time.
 
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