If you'll allow me to ship mine first I'd do so then you could swap it out and ship yours back. I have the factory synthetic set, brand new in the box unfired.
I have a Mac 90 in stock that's in mint condition and all original (although the entire metal parts have been Cerakoted black). PM me if interested and we can talk about it. Not trying to get rich, just reasonable fair deals here.
Item Name: Complete Colt M4A1 SOCOM 14.5" M16 heavy barrel uppers
Location: Byron
Zip Code: 31008
Item is for: Sale or Trade
Sale Price: $750
Trade Value or Items Looking For: The worst I can say is no thank you, try me. Needs to be same value or greater.
Caliber: 5.56
Willing To Ship...