Back out with the Lewis.....fizzled again. Even with all the gas leaks fixed, it did the same thing. 4-6 rnds and stop with the cocking handle 1 1/2" short of the sear. And, kinda stuck there, wouldnt move either way without some level of force. I had to use the end of a bigger hammer handle to push it. Once it moved a short distance, all was freed up. While it was in its stuck position, I wiggled the drum to see if that would free it.....nope. I am going to make a gasket for the gas tube connection with something. I am beginning to think the problem is in the feeding. Next time I am going to try much new ammo, I have some 1964 surplus. If not that, I will look in into the feeding system. Would seem odd if that was the problem with 4 different drums.