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I would assume it would be a box made out or corflute or similar to shield the chrono from direct sunlight

Yours is also sheltered from direct sunlight too which will help :thumbsup:

I got mine for free :O_O: it's a sporter model but I have modified it to fit with a suppressor

My comment is I'll never use one again bloody un reliable things I'll stick to my magneto speed :cool: