First I want to say that your business is top notch when it comes to customer service. Braid nailer from early 2000 and some parts are not compatable with my BN125A gun. They sent me the urathane rings for under the housing cap which where to small in diameter. So returned and chose other o-ring from help with their sales rep. Wrong piece again so I called and got credit without having to send them back. Then I decided to try the rubber o-rings anyways. So happy I did because they worked making my guns operational. Thanks EReplacementParts. Com