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Kw4 Ris Wobbles With Front Grip Installed


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#1 wolfreaper

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Posted 15 November 2011 - 04:38 PM

Hello everyone. This is my first post as I am just getting into airsoft. I have a KWA KM4 RIS. It is very solid except for the actual RIS, you can turn it just a bit left and right. I just got a nice fore grip to add to the bottom of the RIS. Now, when you grab that front grip, you can twist the whole RIS (just a bit) left and right. Basically, it feels loose. Is there any thing that I can do to tighten this up? Has anyone already seen this issue? If so, what did you do to remedy it. Thanks everyone.

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#2 gcw360

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Posted 15 November 2011 - 05:46 PM

Hi Wolf - Welcome to the Forum and congratulations on your RIS.  Assuming the barrel nut isn't moving, you simply need to tighten the screw on the top rail at the front of the RIS.  Give this a try and let us know how it works out.

#3 JROC311

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Posted 15 November 2011 - 06:02 PM

Mine does it too. I have tightened the flat head screw at the top but being that it just pushes a clamp against the gas tube, it didn't fix the issue. This is one of the things you are going to run into with a two piece non free float rail system. It annoyed me at first a little and I even tried putting different things from cardboard strips to small thin plastic strips in between the clamp and the gas tube. It helped some at first but I suspect it has just flexed the gas tube down some because it's pretty much back to the way it was. There are some products that are remedies for this, but to be honest I have simply gotten use to it now and I don't really want to transfer the force to the rail on the upper receiver since that actually needs to stay rigid. The ris for me doesn't need to be all that precise because all I use is for is a vertical fore grip which I only really use when I have a flash light mounted to my ris. If I'm not using the flashlight I grip the mag well instead.

Anyway, here is a link for one of the rail fixes I was refering to in case your intrested. http://www.airsoftat...tor_p/35504.htm

Edited by JROC311, 15 November 2011 - 06:02 PM.


#4 wolfreaper

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Posted 15 November 2011 - 06:02 PM

gcw360, thanks for such a quick reply. Ok, so I totally see the screw that you are talking about. It is really tight already. I took the RIS off and noticed that its the front sight that has some play in it. That, in turn, is causing the RIS to have some movement. So I guess I have to revise my question now. Is there any way to "tighten" the front sight so it doesn't have any play in it? Thanks.

JROC311, thanks for your input also. You replied while I was typing this. lol.

Edited by wolfreaper, 15 November 2011 - 06:03 PM.


#5 JROC311

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Posted 15 November 2011 - 06:29 PM

If you have play in your front sight that would cause it too, but make sure your whole outer barrel isn't turning with the triangle sight. Maybe your barrel nut is loose? if the outer barrel is tight and your triangle sight is rotating on the outer barrel then maybe the roll pins holding it on could be bent slightly causing the play?Maybe new pins would fix it if so. Unless the barrel or triangle sight itself are out of tolerance( holes/slots too big). Also the screw in the top of the rail is very short and will only protrude down so far even when the screw tightens as much as it can be. Not saying that your triangle sight is not the culprit just thought I would mention it.

#6 wolfreaper

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Posted 15 November 2011 - 06:35 PM

JROC311, thanks for those suggestions. I removed the RIS and the front triangle sight has play in it. It will rotate around the barrel slightly left and right. The barrel does not move at all.

Also, thank you very much for that part suggestion from Airsoft Atlanta. I just ordered it. It was made for exactly this issue.

This forum is great. First time on and problem will be solved.

If there is any way to tighten the front sight, I would still like to hear it though. :-)

Edited by wolfreaper, 15 November 2011 - 06:42 PM.


#7 JROC311

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Posted 15 November 2011 - 06:50 PM

My triangle sight has a very slight bit of play in it too. Maybe a mm at the top of the sight post. But I get more play on my ris than that. I can hold my triangle sight and barrel at the same time to keep it from moving and I can still rotate my ris some. How much play do you have in your triangle sight. The same amount you have in your ris?


Re: edit.  The only way I would know to fix it properly is knock out the roll pins with a roll pin punch to see if they are damaged/bent/out of round, or the slots on the barrel are worn/too big.

If you still couldn't find the culprit or correct it  you could get a new sight/gas block that is held on by clamping force with screws. There are several different styles from flip ups to just gas blocks with no sights.

I use a red dot sight so I don't even worry about the front triangle on mine and I also find it easier to sight in with hop up applied since the iron sights are designed for bullet drop and not bullet climb lol.

Oh and welcome to the forum too! There is alot of good guys with lots of experience and good information on here.

Edited by JROC311, 15 November 2011 - 07:14 PM.


#8 wolfreaper

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Posted 15 November 2011 - 07:14 PM

I have the same amount in the sight as the ris. I moved the carry handle to "bridge" the ris and the main riser, just like that part is going to do, and it was rock solid. Once that part comes in I won't mind that the front sight has a little play in it because this part will hold everything in place. Thanks again!!!!!!

#9 JROC311

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Posted 15 November 2011 - 07:19 PM

Do you already use a scope/sight other than your carry handle. Not saying you don't know this already but the carry handle won't work with the rail bridge.


We tend to always type at the same time lol.

#10 JROC311

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Posted 15 November 2011 - 07:30 PM

I would be intrested to know how you like the rail bridge after you get it on if you don't mind.

#11 wolfreaper

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Posted 15 November 2011 - 08:23 PM

I am aware of the carry handle not fitting with the bridge, but thanks for pointing it out. I will be using a red dot as well. I would like to get rid of the triangle sight and just use a gas block, then use flip up sights as back up. That is a whole different thread I'm sure, because I'd have questions about that as well. I will be glad to update this thread with pictures and a review of the bridge as soon as I get it and put it on. I believe that I should have it before this weekend. I'll let you know. Thanks again.

#12 gcw360

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Posted 16 November 2011 - 04:15 AM

When you decide to remove/change the front sight, there are several threads that address the options you have.  Just let us know if you have questions.

#13 wolfreaper

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Posted 18 November 2011 - 05:07 PM

I just want to thank you all aging for your assistance with this. I purchased the bridge part that JROC311 suggested. Awesome suggestions by the way. Here is a pic of it installed just in front of my red dot sight. The fore grip and RIS are now SOLID AS A ROCK!!!!! This made a world of difference for me. Everything on this gun is so solid and this little wobble really bothered me. Now it is PERFECT!! Thanks again guys :-)

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#14 JROC311

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Posted 18 November 2011 - 06:05 PM

Glad it worked for you! Looks good, and still lots of mounting options for a buis if you ever wanted to use one also. And thanks for posting a pic!

#15 vanevery

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Posted 19 November 2011 - 12:44 PM

Will the carry handle fit on the rail now that there is a RIS Bridge on it?

#16 gcw360

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Posted 19 November 2011 - 03:10 PM

No, it won't fit properly with the bridge.

#17 Ill whiskey

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Posted 25 January 2014 - 07:59 PM

Hey, I know this post is old but I found a way to stop all the wobble.. Use an accessory that is long enough to connect the upper receiver rail and the top rail of the ris, for example I used a little scope riser mount, this eliminates the top part of the ris wobble, for the bottom half of the ris, I put a thick rubber band around just the bottom piece right behind the rail and put it back on, feels so much better now, and the riser mount adds a neat look

#18 Jesse Hammil

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Posted 29 January 2014 - 08:14 PM

Thank you! I figured the loose ris was normal.  Tightening down the screw in top fixed it for me.  Solid as a rock!




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