Ok, so I here's what I have...
A Steyr 1908/34 in 32 cal. If you push the spring tensioned lever on the left side down, then it allows the forward portion ( barrel and recoil spring assembly ) to pivot/tip up and forward. Sounds like yours fits this description, BUT I think the 25 cal ones are smaller and we have different model numbers.
A Pieper 1909 in 25 cal ( but not entirely sure as it has things in common with a couple models..ie the 1914 , the Arico and the Pieper-Steyr ). It is considerably smaller than the above AND even though it has a release lever on the left, when it's pushed down, I can lift the entire slide assembly off the frame. There is NO spring putting any pressure on the release lever.
http://www.littlegun.be/arme belge/artisans identifies p/a pieper nicolas gb.htm
See the above link, and scroll all the way down. Mine is very similar to the Steyr, but has a few noticeable differences.
Here's another link with a picture of parts...scroll down to the model 1909 and click on the picture.
http://www.vestpockets.bauli.at/gunparts/parts.htm
Sorry, I don't think I can help ya any more than that.