hkg3k- No disrespect at all. I posted last year about a trunnion I was using for a 1919 build. It was a collection of parts, not purchased as a kit. The trunnion holes were just slightly off and I was asking for anyone who had experienced that before. One or two people thought it was an Argentine 1919trunnion, but it was not conclusive. I was just going by my recollection. I have pics somewhere of the misalignment with the side plate.
As to this one, I have no idea what boman has or whether or not the Argentine ones were chromed. Certainly the one I had was not, but I still don't know what it was off of. I plugged and re drilled it to fit.
B.A.R.- I have two Colt 1928, Argentine contract (I believe) bolts. I thought they were in the white, but someone posted recently that these were nickel plated. I looked again and I think that may be correct. Don't know if that was done to the Argentine 1919s as I have not seen one. That appears to be the case for the Colt Commercial water cooleds though, at least the ones that were brought back in from Argentina. Don't know if all the Colt commercial production in the between-the-wars period was done that way.