MOE Butstock for an RRA

Could Someone tell me if I need a MilSpec or Commercial size MOE for my RRA? Thanks in advance.
Scott

Commercial. That’s what I use on mine.

http://store.a51tactical.com/index.php?main_page=product_info&products_id=1647

49.95 at area51tactical with shipping for $8

I don’t work there but I’ve bought alot of stuff and they ship pretty fast.