Mag-Fed Hammer-action blaster (See comments for description) : r/Nerf
Amazon.com: NERF Fortnite SR Blaster - 4-Dart Hammer Action - Includes Removable Scope and 8 Official Elite Darts - for Youth, Teens, Adults : Toys & Games
NERF Roblox Jailbreak Armor Includes 2 Hammer Action Blasters Ages 8+ Toy Gun | eBay