Jump to content

Gen1 M4 Outer Barrel Separated From Upper Receiver

Not Broken Just Separated

  • Please log in to reply
3 replies to this topic

#1 vanevery



  • Members
  • PipPipPipPip
  • 1,054 posts
  • Gender:Male
  • Country:

Posted 27 April 2012 - 08:54 AM

Gun: General Info
Upper Receiver and Outer Barrel are from a KWA Gen1 m4.
I did this because I like the m4 UTG Hand Guard Rails I have on there and for the fact I could use a mock suppressor without adding length to the gun. I like the look of it.
The Suppressor is a JBU JB31 and fits perfectly flush with the 509mm inner barrel with a repositioning of the gas block this suppressor comes with.

I took this gun out for some testing two weeks ago.
While shooting I noticed that my hand guards began to wobble. Wobble quite badly.
These are UTG m4 hand guards that secure with four allen wrench screws.
In the four years I have owned the gen1 upper assembly from my gen1 m4 plus UTG hand guards, there has never been even the slightest wobble.
These things are solid.

Today I decided to take the hand guards off and take a look at everything.
I noticed first that the gas tube was not inside of its insert in the upper receiver.
I pushed the gas tubing into the insert. It stayed so I put my hand guards back on.
Solid! No wobble. Thought I was good to go.
When I picked the gun up by holding it by the hand guards, the outer barrel just slid right out of the upper receiver. I was like, What!

Interesting thing was that nothing looked broken.
I removed the delta ring and took a look.
Looks like the outer barrel is secured to the upper receiver in what I would describe as a outer barrel mount that looks like the base of the outer barrel. There are 2 gas block type allen screws on each side of it totaling four screws that lock the outer barrel down and hold it secure in place.
I guess these screws just became loose over time and now just need to be tightened down.
I don't know if 2gx guns are like this. I have not checked my other guns to see.

My question is this:
When I reposition everything back in place and tighten down the outer barrel / gas block allen screws,
should I use a bonding agent such as JB Weld, Goop, Silicone or whatever you can think of on the inside of the outer barrel walls to help prevent this from happening in the future?
There is a tongue and groove placement so that would be a good place to apply the bonding agent.
This will be done as to not interfere with the inner barrel in any way.

I have included some pictures. They are from my cell phone so they are what they are in terms of quality.

#2 gcw360


    Supreme Guru

  • Super Moderator
  • PipPipPipPip
  • 12,152 posts
  • Gender:Male
  • Location:New Jersey
  • Interests:Airsoft (Especially repair and customizing), Fly Fishing, Fossils (Especially Dino), Snakes, Photography
  • Country:

Posted 27 April 2012 - 06:04 PM

I would see if KWA has a 2GX outer barrel for the M4A1.  That's what I did...I replaced my first gen with a 2GX and have never been happier.

#3 xKingSizex


    Customer Service Manager

  • Administrators
  • PipPipPipPip
  • 1,879 posts
  • Gender:Male
  • Location:Diamond Bar, CA
  • Interests:Umm, airsoft...
  • Country:

Posted 01 May 2012 - 09:49 AM

Just use a little blue thread locker on the set screws when you secure the outer barrel again. You will be good to go!

#4 vanevery



  • Members
  • PipPipPipPip
  • 1,054 posts
  • Gender:Male
  • Country:

Posted 03 May 2012 - 06:47 AM

Got everything put back together.

Used 100% clear silicone in the groove slot and in the area that the 4 allen gas block screws tighten down into.
Matter of fact, I applied silicone to cover this specific entire outer barrel area , about 1 inch or so in length.
The reason I chose to do this was:
1. Create a permanent bond at this outer barrel connection.
2. This specific area slides into the outer barrel mount base - the piece that connects the outer barrel to the upper receiver and is actually secured down by the delta ring - so no silicone can reach the inside of the outer barrel.


0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users