TFB’s resident South American gun expert Ronaldo Olive sent us these photos of a Colt M16A2 Commando (Model RO735B) owned by the Polícia Militar do Estado do Rio de Janeiro (the Rio de Janeiro State Military Police).
The upper receiver has been blown apart, the magazine baseplate has been blown off and the bolt is lodged in the buffer tube. These symptoms point towards an out of battery detonation. I hate to think what damage was done to the operator. Ronaldo was not given any additional information about the incident.