Here is a still (and an enhanced crop) of Deon holding a pistol. This looks to be a top-break revolver, like an Enfield or Webley.
Here is a Tetravaal Scout (not Chappie) holding a large rifle. Can you identify it?
Here is a still (and enhanced crop) showing Chappie holding a ‘mystery pistol.’ Can you identify it?
Here are some screencaps (and a crop from the poster) showing the simplified RSAP shield decal on the Tetravaal Scouts.
Made a few more variations on the RSAP decal and the Tetravaal logo.
The coat-of-arms on the police patches (and badges, etc) appears to be a variation on the coat-of-arms of Gauteng Province, home to Johannesburg (the setting of our film) and Pretoria. I recreated the RSAP patches and decals, and made these backgrounds.
The Scout robots wear a patch on their chest that is clearly derived from existing South African police shoulder patches. The patch says “RSAP” (possibly standing for Republic of South Africa Police) and beneath that “Police Robot Assistant” in English and Afrikaans. Note that on the patches, ‘Assistant’ in Afrikaans is misspelled. Compare the images below, one of a real South African police patch, and one of the Scouts’ patches.