7.62x39 AR build question

[snowman]

I'm going to build an AR in 7.62x39 and was wondering do I need a different spring and buffer in the lower or will a normal 5.56 one work?

I have a DPMS upper for now, and I am leaning twards getting a lot of my parts from Spike's Tac. They seem good. Anyone with some experience with them. Let me know how it went. Thanks

 

[antdog/zook]

i have normal .223 adjustable stock/tube and spring on my colt 7.62x39 sporter.