| 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. |