The Stag 15 300 Blackout 16 inch Upper is just 2 pins away from taking advange of the hottest caliber in the AR 15 market. Compatible Stag 15 Lower of your choice, this package features a 16 inch 1:7 twist QPQ Nitride barrel, 30 caliber A2 birdcage flash hider, and Stag Arms Slimline 13.5" M-LOK Handguard. Federal law requires this product to be transferred through a licensed FFL dealer. Stag Arms requires a copy of the dealer's FFL for verification. It's the customer's responsibility to notify the dealer of the order.