HellJumper Posted January 1, 2018 Share Posted January 1, 2018 Hey guys, I was wondering if any of you had a chance to see what tracer units can fit on the arp-9 due to the threads being a 1/2" behind the barrel shroud? Link to comment Share on other sites More sharing options...
alex90 Posted January 2, 2018 Share Posted January 2, 2018 why not try looking at this as an option https://www.fire-support.co.uk/product/madbull-ultimate-3-in-1-hop-up-chamber-unit-including-led-module yes they are a tad expensive but they do work very well Link to comment Share on other sites More sharing options...
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