I've had experience with all three shotguns, the Mossie 930, the Benelli M4 and the FN SLP.
Two of my buddies have the Mossie. One of them was GTG from the first shot. The other buddy had to send his back to Mossberg three times to fix FTE problems. The Mossberg and the FN SLP are virtually identical in terms of look, feel, balance and felt recoil.
My friend with the SLP was also having FTE's. I told him that I thought I had read somewhere that they were a bit finicky about the type of ammo being used. Namely, it had difficulty cycling lower powered ammo. When we switched to birdshot that was ~1300 fps, it seemed to alleviate the problems. However, on a subsequent visit to the range, even the higher power ammo started having FTE's. After further research, others were saying that the SLP's like to be run wet, so we applied some generous lube to the action and it seemed to help. I haven't asked him if he had any problems since then.
Personally, I have the Benelli M4. My thinking is that if someone says, "For the price, xxx gun is pretty good," it means that there is a better option out there if you have the means and ability to purchase it. The Benelli chews up any and all ammo I feed her. To further test the quality of the gun, I made it a point to clean it as little as possible. I have had over 1200 rounds in my shotgun and other than wiping down the factory lube and applying Slip2000
before firing round one, I have not cleaned the shotgun
at all. No removal of the bolt, no bore snake down the barrel, not even wiping down a single part. And the shotgun
just works.
Of course, to each his own, YMMV, just my 2 cents, etc.
