The Mad Bull Ultimate hop-up unit is a really innovative design for the M4/M16 series AEGs. It allows easy and precise hop-up adjustment do to the larger diameter wheel which has been relocated. The traditional style hop-up units with the small adjustment wheel on the side are usually either too hard to fine tune and rotate smoothly or too loose and vibrate loose and back off from your idea hop-up setting. This can be a real annoyance during game play. Ultimate hop-up units are fully compatible with the Mad Bull LED Tracer unit (optional) attachment which allows for a completely hidden tracer solution. Negating the need muzzle mounted tracer units or tracer magazines. 3 Functions in 1: (1) Tracer unit: You can attach a Mad Bull LED tracer unit on this Hop-up unit. This is an optional accessory and is sold separately. (2) Chamber lock: With this new hop up design you will not have to worry about losing and dropping several bbs with a magazine change. This new design provides you with a way to keep bbs in your AEG and ready to use and not on the floor and even better it stabilizes the top of the magazine to ensure a secure and flawless feed of bbs into the AEG. You can take out the oring if you don't like this function. This function is designed by Brian Holt. (3) Easy adjust Hop-up: Compared to traditional Hop-up, our Hop-up can be adjust easily. Includes Mad Bull Blue 60° hop-up bucking ***Inner Barrel Not Included***

Upgrades may require expert installation. Damages resulting from incorrect installation will not be covered under the manufacturers warranty.

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