I have a two position stock that came off a Sporter 11, I got it with a 16" upper and wondering if it's orginal Colt. It's made of fiberlite type material and does have stake marks. Anyway, I'd like to trade it for thirty round magazines and do'nt want to advertize it as Colt if it is'nt. Would also like to know what a reasonable trade would be for 90% or better 30 round magazines. Just want an even trade.Thanks, Jim.