Not this BS again, 70% of the suspected guns of US Origin were either confirmed or couldn’t be verified but are assumed (no serial number).....The other 90% of guns in Mexico weren’t even checked.
But, but, but, I thought defacing the SN was illegal. Then there’s this:
http://gunalizer.com/el-chapos-50-cal-was-acquired-through-fast-and-furious/
I thought originally there was some question as to where the 777 destroying .50 cal came from. According to the link it was a f&f traceable weapon. Weird huh?