Nerf Regulator. Select Fire, New Stock, 3 New Barrels. Two of them have Tac Rails. Most likely using the conveyer belt pusher system. : r/Nerf
Amazon.com: NERF Ultra Select Fully Motorized Blaster, Fire for Distance or Accuracy, Includes Clips and Darts, Outdoor Games and Toys, Automatic Electric Full Auto Toy Foam Blasters : Everything Else
Nerf N-Strike Modulus Regulator Select Fire Full Auto Blaster Clip | eBay
Completed select fire modulus ECS-10 build. I printed all of the parts for it and designed and built the select fire board. It has an I2C OLED for showing important info. Motors
NERF Modulus Regulator Switch Fire Blaster w/ Full Attachments | eBay
Modified Select-fire Short Dart Nerf Stryfe - Etsy
REVIEW] Nerf Modulus Regulator | SELECT-FIRE IS HERE!! - YouTube
Amazon.com: NERF Modulus Mediator Blaster - Fires 6 Darts in a Row, Pump Action, Slam Fire, Includes 6-Dart Clip and 6 Official Nerf Elite Darts (Amazon Exclusive) : Everything Else
Stryfe | Brushless | Solenoid | Select Fire : r/Nerf