Not looking to sell but would like info on this gun from someone who knows about military 1911's

It has a colt slide. frame is marked "United States property M1911A1 US Army"
The serial number is from a ww1 colt.
There is a FJA inspectors mark . Also a partially struck ordinance Dept. Inspection stamp
Is this gun a mix of ww1 and ww2 parts?
Thanks

It has a colt slide. frame is marked "United States property M1911A1 US Army"
The serial number is from a ww1 colt.
There is a FJA inspectors mark . Also a partially struck ordinance Dept. Inspection stamp
Is this gun a mix of ww1 and ww2 parts?
Thanks


















































