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King Arms Metal Hop Up Unit for M16
[02639 / KA-M4-16]
by J. STEIN verified buyer Date Added: Tuesday 06 October, 2009
Product Information:
Great hop up unit. Installed in a stock CA M15A4 2009 X-Series. The previous hop up unit was shot and I when I went to investigate what was causing the problem, I broke the flimsy c-clip for locking the barrel onto the hop up unit, so I decided to get this upgrade.

Full metal construction makes this a durable, long lasting, and reliable hop up unit. Range improved dramatically over the stock hop up unit (by a factor of 2). Range comparison was performed using an all stock gearbox/barrel with a Systema Bucking and an Echo 1 H-Nub.

The c-clip, though also plastic, was made much thicker and tougher and won't break as easily as the stock c-clip. It fits very securely over the barrel notches and is actually semi-difficult to lock into place due to its tight fit.

As mentioned by previous reviews, the nub arm retention spring is indeed a bit too large to properly fit into the unit (both diameter and length wise). The easy solution was to take your existing spring from your stock hop up and voila.

- Metal Construction.
- Increases Range.
- More Reliable and Consistent over Stock Hop Up.
- C-Clip is Durable.

- Nub spring is too large to fit into unit without modification.

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Back Write Review
King Arms Metal Hop Up Unit for M16
[02639 / KA-M4-16]

Out of Stock

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