15 replies to this topic

[Carlough]

The guns past warranty, and since I have little experience with GBB internals, I was hoping I could get some ideas as too what the problem is.

The gun will not fire in any firing mode.
When the charging handle is pulled, the bolt will not go forward fully.
The gun is in good shape, and nothing is wrong with the mags.
The hammer wont release when the trigger is pulled, but I suspect that's a feature built into the gun, to prevent the hammer from moving if the bolt isn't closed.

I see no BB's in there, so I'm out of ideas as to what is wrong.
Anyone have an Idea?

[niko_gpsy]

Have you checked to see if there is anything like a bb's in your bolt that keeps it from completely going in forward position?  You may need to take the top cover off to examine further.

[gcw360]

Any chance you can take some pics with the top of the receiver off?

[Carlough]

yes, pics will come soon, but nothing looks out of the ordinary.
I have already cleared the BB from the chamber, and have removed the top cover.
Its really weird. It seems like something is in the way, but i cant see anything.

[niko_gpsy]

Can you post pics with the bolt off?  I have a feeling you will be able to see when you take the bolt off the gun.  The instructions to do so is in the owners manual and here........................

[Carlough]

Okay, just got the gun back, it was at a friends house, long story.

okay, pictures, the resolution isnt perfect, but hopefully it will do.

http://imgur.com/a/xTEUr


I'm going to reassemble it, see if the problem persists.

EDIT: Yea, problem still persists. The hammer and bolt function perfectly until the alignment pin and its plate go into place.

Edited by Carlough, 10 April 2012 - 08:46 AM.

[Carlough]

Okay, so upon closer inspection the valve inside of the bolt had a small silver piece, in the rear of the cylinder, rotate.
I don't know how, I don't know why, but that was the problem.

Upon righting its position, the gun fired. So. how do I prevent this from happening again?

Edit: So upon looking into the vlave thing, i noticed that 1, the screw wasnt screwed in,
and 2, that the springs that are supposed to be thier arent.

Edited by Carlough, 11 April 2012 - 11:38 AM.

[niko_gpsy]

What 's are the part numbers?

[Carlough]

It looks like Looks like 133, 127, and 129 rotated sideways. It also appears that both number 87's are disconnected.

Edit: I retract that statement. The 87's aren't disconnected. They snapped. Which only answers half the question. The last question is how did 133 come unscrewed?
Do I have to order the 87's through the Pro shop, or can I buy them elsewhere?

Edited by Carlough, 11 April 2012 - 03:05 PM.

[gcw360]

I believe Airsoft GI may have them.

[Carlough]

Nope, looks like I'm paying 8 dollars in shipping on a two dollar item.

[gcw360]

Why not order $30 worth of stuff and shipping is free with FREESHIP code.  Or, request non-priority shipping and pay around 3 bucks.

[quezanart]

I have had the cylinder return springs (part #87) in my KMP9 snap on me on multiple occasions.  I would suggest ordering more than one set so you have backups just in case it happens again.

As for part #133, it may have come loose if no loctite was applied to it at the factory.  The vibrations generated when firing the gun could eventually cause the screw to come loose and back itself out.  I've done a lot of automotive work and it can happen to screws and bolts in cars sometimes.  The typical remedy is to put loctite on the threads of the screw/bolt before reassembly.  I would recommend getting some blue loctite for reassembling part #133.  You can find it at almost any automotive parts store.

[gcw360]

I too have had the return springs break.  The fix to help prevent this is to super glue them in place once they are installed (at each attachment point).  Be sure that the glue is completely dry before you test fire.  If you need more information please let us know.

[Carlough]

Thank you for the suggestion, I shall definitely try that.

[VictorNica]

@Carlough-If you are just shipping a small part we can ship it another method for cheaper. Just give us a call at 626-581-1777.