This is a U.S made 130 grain 308 Dia. Green tracer which has a painted brown tip.
From our research this is where these came from.
They were developed secretly during desert storm in the early 90s. Issued to special forces/SEALS to use As part of a ruse to trick enemy forces into thinking it was not U.S forces shooting at them and they would disengage. They knew only U.S/NATO forces shot red tracers. These have the same compound as the orange tracers only the strontium is replaced with barium. Hence the green color.
Sold in packs of 100pc