Since this is a long one, I am going to start with my questions: Why does this thing only have trouble cycling High Base, and how is it possible for oil from inside the receiver to migrate into the gas system? I have been a pump-gunner all of my life and thought the 930 would be a good introduction into semi-auto life. I actually really like the shot gun, and it has already taken its share of clays and Pheasant, but the gas system on this gun leaves much to be desired. Here is my experience so far: Brought the gun home and cleaned the barrel before taking it out for the first time. I did see all of the oil in the thing, but it did not seem “sticky” so I left it. My “old school” feeling is oil is good on all that moves. Right? The first time shooting the gun was at the end of an Elk hunting trip and we put 3 boxes of Winchester Field Loads though it without a hitch. Boy I was in 7th heaven. Cleaned the gun real good when we got home at which time I also oiled it “real good”. I still had not read the instructions. Second time out was with the clays, which I have never shot in all these years, and again the low base ran perfect. When we ran out of the low base, we switched to some 2 ¾” “high base” and the trouble begins. 1st shot out of the cannon the gun goes bang and then click, no round in the chamber. I hand cycled the next round in and bang click no second round again. Tried a few more times and hung it up. Got home and out comes the instruction book. Go figure that you are only supposed to lightly oil and wipe it off the gas system. OK my bad. Cleaned her all up, lightly oiled and wiped off the mag tube and the inside of the gas cylinder and put’er away. Third time out was a pheasant hunt and I was ready with Remington 2 ¾” High Base #6’s! 1st bird up gun went bang, bird falls and I have next round in the chamber, SWEET. 2nd bird up needed a second bang but only got a click, no round in the chamber. Next up was a double. Dropped the 1st bird but 2nd bird just got a click. Here is where the loose forearm comes into play. When we got back to the truck, I pulled the forearm off and everything seemed to be moving fine, but when I put the forearm back on it was now loose. This was not the case up until now as it has been tight up against the forearm retainer since new. Got out all of the different boolits that we had in the box which ran from the low base stuff to some 3” turkey loads and this thing ate them all no problem. Went home, cleaned up the right way and put away. Forth time out was to do some pattern testing with some duck loads which are #2 Fasteel. Since we were only shooting one round at a time I had no worries, but when we got done it was fun time. I pulled the limiter out of the mag tube and was mixing up the rounds trying to induce a failure and after about the 7th “mag dump” it finally happened with a Winchester high base leaving an empty chamber . That was the only one though so I didn’t feel too bad. But, when I got home I found that the gas system was an oily goopy mess.