POTD: A Mystery Fifty Cal

Nathaniel F
by Nathaniel F

Gun writer Ronaldo Olive sends us photos of a .50 cal sniper/anti-materiel rifle captured in a drug raid. He says:

This .50BMG rifle has just been seized in Rio de Janeiro by crack BOPE (Batalhão de Operações Policiais Especiais) Military Police troops in he possession of a group of drug dealers, but I have been unable to identify it for sure. The stock appears to be one marketed by ArmaLite for its AR-50. Any suggestions? Thanks.

The rifle looks very similar to an Armalite AR-50, even being marked “Armalite AR-50A1” but is clearly distinct, having a magazine well, a different barrel shape and muzzle brake, different finish, different rail, and other details. A photo of an Armalite AR-50 is below, for comparison:

Can anyone identify the rifle?

EDIT: Ronaldo sent us a clearer picture of the fake markings on the rifle’s receiver:

Nathaniel F
Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. He can be reached via email at nathaniel.f@staff.thefirearmblog.com.

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  • Jesper Rex Andersen Jesper Rex Andersen on Aug 19, 2015

    A Company named "kammerdeinerguns" made a conversion of the AR50, to take magazines, from the Harris M96.

    I have found several mentions of the company, but never any pictures. Maybe it is one of their converted AR50's

  • Tothe Tothe on Aug 24, 2015

    It's not a Maadi-Griffin. Beyond that, I have no idea.