Back in 2015, TFB (http://www.thefirearmblog.com/blog/2015/08/15/potd-a-mystery-fifty-cal/) showed a DIY .50BMG caliber rifle that was seized from criminal hands in Rio de Janeiro by the local Military Police BOPE – Batalhão de Operações Policiais Especiais (Special Police Operations Battalion) and which was falsely marked as an “ArmaLite AR-50”.
It just so happened that a very similar “Frankenstein” gun was found with a large group of outlaws who took part in a recent (April 24) multi-million dollar robbery from a bank security company in Ciudad del Este, Paraguay, near the Brazilian borderline with Paraná State. Some of the guys trying to escape back to Brazil were caught (some, actually, killed) by agents of several Brazilian police agencies involved in the chase, when one of the weapons used in the crime was seized. Guess what? It was a close copy of the earlier mysterious gun.
Images made available by Brazilian police authorities show that the so-marked “AR-50A2” features a somewhat different, box-like muzzle brake and general features basically common to the weapon found two years earlier, including the detachable box magazine that fits under the receiver. Unlike the “AR-50”, the “A2” barrel is not fluted.