This is a Sig Sauer Copper known as the Elite Performance chambered in 300 Blackout, model E300H1-20.
ELITE COPPER HUNTING all copper superior hunting rounds yield consistent 1.8X diameter expansion using premium-quality powders and primers for minimum velocity variation. Perfected for AR style rifle feeding" optimized nose geometry combined with premium nickel-plated shell casings deliver consistently reliable accuracy for taking down game.
Features:
300 Blackout
2,250 Feet per second
120 Grain Copper HT
20 Rounds per box