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My experience is that the FFT shell lifter is garbage. If I would slowly move it I could get it stuck. I had many issues and tried to fix it a couple times where I got it to move like it should but eventually went back to rubbing. Put your oem lifter back on and see if it solves the problem.

Thanks for sharing your experience. Hopefully as you say, you have solved the issue. In any case thru this you have gained intimate knowledge of the operating system and how the parts interact and rely on each other to an extent, for flawless operation of the gun. You probably heard all this before but, a couple points.... One also should remember that many times aftermarket parts do not immediately "fit" because there may be a thousandth more here or a thousandth less there when made, that requires some fitting or in some cases, just plain won't work. It's been recommended that one mod be done at a time, test ok, then do another so it takes the guesswork out of what's causing a malfunction. Post back after you fire it to let us know.👍🙂

Update: Well guys, I think I have solved my problem. The video I watched showed the shell stop spring being looped around the tab on the shell stop plate. I found the install guide by StrangerDanger and saw that the spring is simply placed on the plate. I tore down my M4 again (for the probably 12th time today) and put the spring as per the write up. Immediately I noticed the bolt release was so much lighter. I loaded the tube up with snap caps, and cycled through the whole tube. Tried not to get too excited as they were heavy snap caps, so loaded it fully with 00 buck shells. Cycled through the whole tube 4 times. Had one shell on one full tube cycle fail to load, but I'm going to chalk that up to hand cycling and not being forceful enough. Off to the range tomorrow to test it with the piston system doing the cycling work. If I have any issues I think it will just be further adjustment of the shell stop plate and spring. I'm just really relieved I didn't do something really dumb like irreversibly damage the receiver in the vice.

I’ve settled on what for me is the best light option. Inforce WML with IR and Strobe functions. It’s lightweight and blends into the Benelli railed hand guard. Nothing wrong with the Streamlight or Surefire options, but this seemed more useful for me, especially since I do have a PVS-14 setup to take advantage of the IR feature. I’ve been using the same tactical light on a FN PS90 for a few years with good results.