A friend gave me a Ithaca/SKB XL900 to repair. The trigger or trigger sear does not engage and therefore it does not fire. I had an older 300 trigger group and it looks identical. There is a lever at the back of the trigger assembly. When lifted forward or up, the trigger engages and releases the hammer. It will not do this when in the gun. Nothing looks broke or incorrect inside the receiver. The 300 trigger does the same thing. I have looked at it so long, my eyes are crossed. I suspect it's an easy answer, I can't see for trying to hard. Any suggestions would be greatly appreciated! xxxchris dot radde at gmail dot comxxx x's removed if the link above doesn't work.