Jump to content
Nicky blue eyes

Umerex p99 co2 downgrade issues

Recommended Posts

I got this pistol and it was firing at 380 fps.  Looked on good old youtube and found 2 different methods of lowering the fps. How ever neither was in english. The method I used was to put  an o ring in the gas chamber to reduce the amount of co2 going in.  The slide only slightly goes back now. Not really a problem because it dosen't rely on the slide to operate the system how ever it now seems to have lost some distance. Is this normal? I thought it might be leaking but I couldn't hear any hissing. This is my first gbb pistol so I'm not sure what i should be looking for.

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...