RE: Looking for info on the SKB/Ithaca XL900 12g
Jdircksen, If your shotgun is the 900 XL I belive it's recoil operated not gas. Try to push the barrel to the rear or unscrew the magazine cap. The recoil model has a large spring over the stainless steel magazine tube. There may be a gas model, but the two I have are both recoil operated.