Eagle Arms EA-15 Caliber: Chambered for 5.56x45mm NATO (also safely accepts .223 Remington). Receiver: Forged 7075-T6 aluminum upper and lower receivers with a durable anodized finish. Barrel: 16-inch matte-finish heavy barrel (H-BAR). Older models often feature a 1-in-9" twist, while modern production utilizes a 1:8" RH twist for stabilized versatility across bullet weights. A2 Style Carry Handle Stock & Handguard: Standard 6-position collapsible stock to easily adjust length-of-pull, paired with a 6-inch standard handguard.