Paintball

[Steelrat]

Hi,

I was told the cog in my AT needed to be replaced, how exactly do I go about doing that?

Also, I believe mine has the HPA setup, but how can I make sure?

[Gumby]

The cog is held in place by the long c-clip under the guide plate. To remove you just slide the clip forward until it clears both posts. Now you lift the bottom end, the flat side that faces down when you are holding the gun normally. Once you have the cog lifted 90* it will slide into the receiver and drop out into the magazine well. Only reason you would need to replace it would be if the cog pin is broken off. So many people think that the 4 flat teeth have worn down. They are supposed to be flat. They help lift the cog over the chain when it begins to move forward.

Fastest way to check if your gun is HPA is to look into the ASA. If there is a brass filter it is set up for CO2. No brass filter does not exactly lock it as HPA, some people have drilled thru the filters in an attempt to increase air flow. It does give you a fast check. The other would be to look at the cycle valve.

[Steelrat]

Okay, I took the whole cog deelie apart, and everything looks fine. I did notice, however, that the bolt seal is loose, and not attached to the bolt. Is that normal? If not, how do I fix it?

[Gumby]

Bolt seals do loosen up, especially if you leave paint on the bolt face. Clean it off with alcohol, not the drinking type either, and then use a good adhesive to bond the flat side back in place. We use Loctite 410. Make sure there is no ridge around the bolt after you are done.

[Steelrat]

Thanks. I suspect that the previous owner assumed there was a problem with the cog that was causing feed issues, when it was in fact a loose bolt face. From what I saw, if the face was loose, it might block the feeding of balls, correct?

[Gumby]

Most feeding problems are results of bad guide plates or mis-indexed magazines. The bolt seal really doesn't have the 'meat' to prevent a ball from being loaded. Make sure that the chain lugs are stopping at the correct positions, the top lug should be just below the level with the top of the magazine. There are windows in the black portion of the newer magazines that show a lug when the magazine is properly timed and in the correct place.