Made in Brazil by IMBEL (Industria de Material Belico do Brasil), which supplies other gunmakers as well. Typical routine is to make the parts, assemble into full pistols, fit, then disassemble. Fitted kits are then shipped to wherever to be reassembled/refitted/marked/etc.
Of course, IMBEL also sells loose' parts. Lots of gunmakers all over the world have bought such parts from IMBEL, from Armscor, from Norinco, among other low-cost manufacturers (notably in Eastern Europe and Turkey), then thrown in pricier parts, fitted and rollmarked the blaster and called it a good day. Good guns do come of it, and Springfield owners certainly look very happy with their pistols.
Precisely what the (re)assembly arrangement is between IMBEL and Geneseo, it lies beyond my feeble ken, and may conceivably have changed over time (that's business, what?) ...or not, but what remains is that IMBEL is a sizable company of quite some repute, and makes forged, cast and (yes) MIM material, but for the 1911A1-pattern pistol you have in mind, the steel has clearly been presented, several times, as forged.
Maybe someone else knows more or otherwise.
hth