Stag Arms was founded with the goal to manufacture reliable, 100% American made, competitively priced ARs, quickly becoming a market leader and one of the largest firearms manufacturers in the United States. The gas piston system on the Model 8 runs cooler and cleaner than a direct-impingement gas systems. Every Model 8 starts with forged aluminum upper and lower receivers and a 16", 4140 steel, chrome-lined, government profile barrel with a manganese phosphate protective coating. The included Diamondhead sights flip up and down to allow for the use of a scope or other optic. Additional features include: a thermoplastic handguard with double heat shields, an A2 flash hider, an A2 plastic grip, a single-stage trigger, and a 6-position collapsible stock. The Plus Package upgrade gives the Model 1 M4 feed ramps, 1 in 7" twist rifling, an MP/HP tested and marked bolt and barrel, an M-16 bolt carrier, a heavy buffer assembly, and one additional USGI mag.