madcratebuilder
Member
The SAI comes in several models. Stocks can be aftermarket or usgi. The receiver is cast then machined, bolt is forged, barrels can be usgi, Wilson or Douglas, std or NM. Older models may have more usgi parts than newer models. A usgi op-rod is desirable but I have never seen a SAI cast op-rod fail. I think the cheapest have to go is buy a standard and unitize the GB, ream the FS, then bed the stock. Mine shoots moa when I do my job.