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I have it on authority that both the 6.5 Grendle and the 6.8 SPC Mags will work. I know, that in my AR, the 7.62x39 mags work with my 6.8 SPC upper with no problems.
 

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Let me make sure I understand all this correctly-are the 6.5, 6.8 and 7.62x39 mags are the same, but with different followers? Are the followers physically different, or just different colors? This would greatly simplify logistics-I am anxiously awaiting the 6.5, and I will definitely get a 7.62 for cheap ammo. I have been facing temptation to get a 6.8 in the meantime, and it would make the decision a whole lot easier if the investment in magazines could also be used for the other two as well. Even if the followers needed to be changed, I could have three times as many mags with just a small investment in different followers for each caliber.
 

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I believe the feed lips are also slightly different. Someone who has one of each would need to put them side by side to compare accurately.
 
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