Good morning!

On a recent classic mag semi to pump conversion, I put a eBay purchased single finger 45 frame to put on it and when to arrived I found that it did not come with a trigger so I scrounged up a stock trigger and pin. Now it seems that the trigger does not pull far enough to hit the on/of and release the sear. So my questions are do I need a different trigger for the frame or do I need to modify the frame in some manner to allow it to work with the stock trigger? I think I have the rod adjusted correctly but not 100% sure (checking that now). I am confident that it is something related to the frame as I swapped it out with a working frame from another mag and it worked fine.
Thanks in advance for your help!
Heavy