PSA AR/AK Build Help Needed

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jimbo74

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So I bought this hybrid upper from PSA awhile ago.

I built on an AR15 Lower. I used 10 rd C-Products Defense Magazines for the 7.62x39 round for an AR15 as this is what I thought was recommended to me.

Went to shoot this, I could chamber, and feed 1 round from the mag. After that, no more. This happened every time I tested it. This upper has less than 10 rds through it.

What did I do wrong on my build?
 

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