Springfield Model 1929 (second Question )

After looking a Stevens catalogs from 1920 to 1947 I have found that Model 94, 948, 958, and 107 look more like the parts that are in side the Springfield 1929 that I have. The problem that I have is that if I remove the forearm the ejector works, but if I install the forearm it will not eject even with on cartradge in chamber? Anybody can help? The fireing pin is removed with a screw above the pin like the Stevens 94 ? Any ideas ANYBODY ?Not like the 85 or 89 Model.The 1947 old model stevens 94 parts inside look the same as the 1929 but the receiver looks like the 107 but with flat side.