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KJW M4

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When doing the shrink wrap mod make sure that the arm still moves freely and there are no rough edges to the part it moves within. mine needed the shrink wrap rubbed down a little with a needle file to get the movement smooth.

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Ok quick hop guide, excuse the quality of the photo's. I had to remove some of the shrink wrap on mine as it was over hopping 0.25's with the hop off.

 

First remove the upper and bolt assembly, then the hand guards and flash hider (small allen screw). Then knock out these two pins

IMG_2044.jpg

 

Slide the front sight off and remove the gas tube (slide out). Next remove the barrel nut with the supplied tool

 

IMG_2043.jpg

 

Slide off the barrel assembly, then flip over and remove this screw and the hop dial

 

IMG_2042.jpg

 

Remove this spacer

 

IMG_2041.jpg

 

Remove this screw (obscured by flash sorry)

 

IMG_2040.jpg

 

Remove the part that secures the hop arm should just drop out

 

IMG_2039.jpg

 

Part shown removed with hop arm held in correct place. Make sure your wrapped arm swings freely through the part that holds it.

 

IMG_2037.jpg

 

To reassemble simply reverse the procedure. If you keep the upper upside down the hop spring should remain in place.

 

Hope this helps.

Edited by weekenny
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Part is designed. Ill mill a few today and get them tested in the gun tomorrow. Ill keep you all posted with the results.

 

Oh, please tell when they're available for purchase ^_^.

 

Finally finished with mine,

 

KJW1.jpg

 

Tell me what you guys think.

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Will it be something H shaped? :P

 

I doubt it.

 

The way the KJW Hop up bucking works is by applying pressure evenly across the ball that is molded on the hopup bucking. An H or V or "SCS" type shape would probably not work because of the hardness and design of this bucking.

 

Correct me if I am wrong.

 

For anyone who was interested in the metal uppers, I'll have a price shipped to the US within a few days, for anyone who missed that post, PM me and I will write you down for a quote.

 

T_Hum,

 

What about an Improved hopup wheel to allow finer adjustments? Possibly a few more steps instead of just 6..

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I doubt it.

 

The way the KJW Hop up bucking works is by applying pressure evenly across the ball that is molded on the hopup bucking. An H or V or "SCS" type shape would probably not work because of the hardness and design of this bucking.

 

 

Ohh ok, didn't know that, I've never actually gone into the hopup unit on my KJ lol

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Any more information on that plastic upper yet? How easy was it to install everything? How well is it holding up / how does it look on the rifle?

 

I want to know if it is worth it to build my full second upper with a plastic upper, so I can just swap my bolt back and forth for my different gats!

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th_KJWHopArm.jpg

 

Sorry for the bad quality. Still need to get some really small dowel pins before I install it. You may notice the front bulb is larger on the revised part. This should allow the hop to be actuated more fully. Testing results coming...

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