I know the true story on that actual gun and still have one myself
there were 3 of them(that I had when I was a LE dealer), they were traded in from a WA State Tribal Agency(Naselle) around 2010. 2 of them went to a friend of mine, who passed away a year latter, the family took all his gun to Oregon....I assume the one being asked about was 1 of his.
the same agency also traded in two factory green HK Fabarms FP6 riot guns, never seen another green FP6 and they were not repainted. my friend also got one, I kept one
they government gave the SIGs to the agency, which is why they are marked that way
they also had 2 M14's they wanted to trade...but still had the happy switch was still in place but supposedly were only semi....they kept those
kinda been waiting for one of these to pop up
so thats the real story on the 220's