You could do that. The uppers in this caliber run from a " don't let it walk by " price of $800+ to a " its the only one ever made " price of $1500-2000. Components do have some bearing on price but due to availability some are gonna still be in mark up mode. I bought mine for $1350 but I have only seen a few in that range over the last 6 months. I have a guy that lives a mile or two down the road that has a Alexander Arms Overwatch upper w/Bus master lower . The gun has a real nice trigger and a Yankee Hill quad rail, a cpl mags, dies, virgin brass, and a cpl boxes of ammo for $2200 obo. There is another complete rifle for sale
on ar-15.com in the firearms for trade section for $150. Good luck!