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This is odd, it looks like it's not getting enough gas to function, but that ammo should have zero issue with that. Does the weapon cycle by hand just fine? Have you verified that both gas pistons are present and accounted for? 1) Verify the weapon cycles without binding by hand. 2) Disassemble it and verify that the gas pistons and gas caps and O rings on the gas caps are all in good shape and present and were not in a defunct state. 3) Verify that all wear appears even and normal with no gouging or deformation occurring anywhere other than where one would expect, such as a bit on the side of the cam pin, the ejection port corners, etc. 4) Lubricate the cam pin and the rails of the carrier, and just everything in general, really. 5) Try a different ammunition. Other questions: Was recoil robust? Were ejected shells thrown 5+ feet away? It is always possible that you got some underloaded ammunition due to a factory error.

Some practice and it will seem to be a nonissue. It works fine, just different. I wouldn't try to modify it.

Please see this thread for reference:

It does cycle by hand just fine. It was a bit stiff in the beginning, but after couple of rounds it is smooth like butter. I have some practice shell caps that I tried multiple times and It never jammed cycling manually. I just took everything apart and I don't see anything concerning. There is a bit of carbon build up on the gas pistons, but that is normal. One thing I noticed is that the magazine tube is quite lubricated. I will have to clean it well before I assemble it back. I was shooting in an indoor rage and recoil was ok imo. I cant tell if shells were flying 5+ feet due to the indoor nature of the range and tide distance between the walls of the cell. Shells were hitting the side wall and bouncing. I did some research and one suggested that it could be related to the recoil spring. I'll give it another shot after I clean and lube it and report.

Sometimes you only want one more! Apparently in the Pepoles Republic of New Jersey you can only have six in the mag. I had a request to make one of my custom "NJ Specials" for a fellow there. The extension replaces the OEM extension, allows 6 in the tube. Joe

I own two M4’s and shoot them quite a bit, I have experimented & dialed in patterning with a ton of different brands & loads. My experiences relative to overall cycle-reliability is to always stay at/above 1250 fps loads, seems other people have validated this as well. Specific to Federal LE13200( 9 pellet 00 1145 fps low recoil)..over the years I have tried it specifically numerous times and experienced failures to cycle, some might call it short-stroking. I have been cursed with OCD with cleaning & maintaining firearms, so when my M4’s are freshly cleaned & wet they will initially cycle the Federal LE13200 but will eventually run into cycle failures. The M4 can definitely be set up & tweaked accordingly to allow for lighter loads, bird shot, etc..but that is not what the M4 is designed or intended for, further validated by it’s love & reliability of heavier pressure loads.

Normal, just takes practice.

Great price... free bump! This shouldn't last long. If I didn't already have one just like it, it would already be gone! ?

I have one in CYL as well and I agree, it does help with muzzle climb, I would not advise grabbing the end of my barrel either, it's wicked sharp. I put a couple loops of gray teflon plumbers tape on the threads over choke grease, it isn't coming off unless I want it off.

I'm not sure how lenient Benelli is with their warranty stuff, but I wouldn't have taken a file to anything. Should have contacted them and sent it straight back...