Nmthree

Bought an M4 about 2 months ago - love it…when it cycles properly. Took the gun out of the box, ran some Remington 1200 fps, 1oz shells (bird shot) through it. Every 4th or 5th round, a shell would get stuck in the carrier. Called Benelli and I was told, the rounds weren’t heavy enough and FPS was too low. I was also told the gun was probably on a ship for 3 months…clean it, oil it and get ammo that was at least 1250 fps and 1 1/8 oz. Cleaned it, oiled it. Bought Winchester 1325 1 1/8 00 & Federal 1 1/8 1500 fps. Today shot about 75 rounds through it and shells keep getting stuck in the carrier. Any advice. See picture attached (of shells getting stuck in the carrier. Thanks in advance for your help.