King Arms Metal Hop Up for M4/M16
- Model: KA M4 HOP UP
- Manufactured by: King Arms
- Material: POM and Zinc alloy
- Weight: 36g
Tech Note: Apply some silicone oil inside and outside the bucking when installing onto the barrel and into hop up chamber. Hop-Up Buckings are wear items and should be changed as often as feasible. And should be replaced when upgrading or anytime the inner barrel is removed from the hop up unit. Small pin holes and tears can occur when removing and reinstating used buckings.