id be highly suspicious of them unless the vendor can provide you with further info as to origin etc .tracer rounds usually contain pho sphorous and IIRCmost if not all rifle ranges etc frown upon/prohibit its use. Ive used em in the military PIA- have seen a few instances of shooting practise suddenly become fire call outs!! military was primarily target indication (at night). my advice seal em in a rtin ,and seal that tin in a tin .dont use.
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