Laser633

Thank you for the help everyone. I figured it out. It was that tab and slot that were hanging up. I carefully filed each side of the tab two or three times, probably taking off a couple thou at most, cleaned it up, and put a very small amount of oil on it: just a light glaze, being sure to wipe off the inside surface. When I tried to put the barrel back on, it was still tight but didn't feel quite like such a hard metal-to-metal stop as before. A few taps on the end of the barrel with a rubber mallet and everything eventually slid right into place! Action works great by hand, and everything seems great. Now to take it to the range and break it in! Thanks, again, everyone. Great community, here.

Thanks for the tips, everyone. The rear rail screw does not seem to be the issue (I was hoping that it would be that easy, though) I removed the bolt assembly and tried watching as I slid the barrel in. On the part of the barrel group that slides into the receiver, the part that the bolt slides along, on the very back end is a small tab. This tab matches with a small slot machined into the receiver. That seems to be where the hangup is, the tab does not fit into the slot. In fact, they seem surprisingly mismatched to my eye. I'll try to get some decent pictures later tonight.

Yep, that looks like the spring in the magazine? That all looks good, here. I'm trying to slide the barrel down over the magazine tube and things seem to hang up right before what I think should be the bottom. It's not the rings that go over the magazine, and I'm trying this without the hand guards. That said, watching closely as I slowly close the bolt, it does look like it engages with the end of the barrel, rotates slightly, and slides inside. Still...I'm wondering about the gas system now, whether something is hanging up inside.

Hello, all. New here, and new to Benelli in general. Sorry if this question has already been asked; I searched a bit and didn't find anything. I just picked up a new M4 shotgun. Very excited, I've wanted one of these for a few years now. I was going through the assembly process, and I hit a roadblock at the very end. The barrel does not seem to seat flush against the receiver. At first, I thought that the plastic hand guards were causing the problem, so I tried assembling without them. No luck. I looks like the barrel stops sliding into the receiver about 2 or 3 mm before the lip meets the receiver. This happens with the bolt forward, locked back, or even removed entirely. The action cycles by hand just fine, so I don't think there's any interference between the bolt and barrel assemblies. Still, every how-to video I've watched shows the barrel sliding down flush with the receiver easily. Attached pic shows the best I can get, with a clear gap (I think that lip should be flush with the receiver?). As I said, the action cycles by hand wonderfully, but I'm reluctant to put a round in there because things are, apparently, not fitting properly. Am I missing something?