I recently used a product called Biostrip 2.0 to strip paint off of a mate's polymer m4. Took a few passes but it removed 99.9% of the paint, and only mildly discoloured the plastic underneath, which was returned to black with some light spraying and matt varnish. Took a while but he was happy...
S&I Eotech and magnifier combo. Includes original case and mount height adapter for the flip to side magnifier mount. Magnifier is in the region of 3x to 4x. Everything functions as expected.
https://www.stackupairsoft.co.uk/product/double-eagle-stanags-mws-mags-/RRGUUCLYM66ZSXWCIGA2IVTI?cp=true&sa=true&sbp=false&q=false
I know for a fact those are my old mags, and the one with the tape should be cheaper as I had to drill out a screw to remove the baseplate. The tapes there to help...