This outfit has the bushings to fit large pin uppers to standard small pin lowers. And what you want.
https://www.jsesurplus.com/coltrecei...etbushing.aspx
Now I understand why that Match Target upper was cheap.
Just spoke to them. In tomorrow's mail.
Phone (573) 334-7616
Fax (636) 547-2618
sales@jsesurplus.com