I am having an issue with a brand new 612 SL jamming. I just took it to the skeet range and shot a wide selection of loads! The nitro express loads cycled, but the lighter Winchester trap loads would not even come out of the chamber (2 3/4 Dram). The 3 dram loads barely cycled or would jam! So how do I adjust this thing, I read that some people turned the gas piston upside down, will this work? Right now the spring on the piston is closer to the trigger then the cap to remove the stock! Any help would greatly be appreciated!!!