I took GSG Firefly to the range for the first time in a while, so far not a spec of trouble with over 400 rounds of CCI 40 gr copper RN MiniMags. I was shooting Armscor 36gr copper HPs fresh stock recently purchased at my LGS. First round fired and was dead on at 20yrs forehead shot on a silhouette. Did not eject, 2nd round jammed. Dropped the mag, cleared it, and could not extract the spent case from the chamber. Actually had to push it out later at home with a cleaning rod which took a solid rap to get it out. Visually inspect the chamber area and nothing noted, casing I expected to see bulged or split looked fine, but no .22 ammo I have, Norma LRN, CCI MimiMags or the new Armscor can be chambered past the bullet head if had fed. Cleaning patches and brushes do clear the entire length of the barrel as normal. Any comments, ideas as to why? I'm shipping it this week to AMTAC in SC under warranty.