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500 rounds of tumbled, polished 5.7x28mm brass


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Yeah they have a coating on the brass.  It’s necessary for it to feed reliably through the PS90 mags (it is a straight case and it lowers the friction).  I clean them with simple green for about 5 to 8 mins in an ultrasonic cleaner (or you can hand shake them in a sealed Tupperware – don’t want to go too long or the ultrasonic cleaner will start taking the coating off too. 

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