Leaderboard

I had the Hayl rail and the feel was great, but like you mentioned the set screws was an issue. At the time there weren’t any better options, but that changed when Briley and Agency came out with their Mlok options. I ended up getting the long Briley rail. They have a shorter one that is the same size as the factory handguard , but I wanted the longer one so my light sits as far forward as possible. I couldn’t be happier with it. It’s rock solid yet removable with no tools. The endless amount of Mlok slots makes setting things up to your liking easier.

Based on the OP's description, the cap retaining pin isn't the culprit. The swivel stud on the magazine cap is held in place by a spring clip. Call Benelli and they may send you one. I don't see them listed in parts catalogs. If they don't have one to send you may have to go with an aftermarket swivel stud. If you're EXTREMELY lucky, yours may have fallen back into the magazine tube and is stuck in there. Remove your magazine spring and follower and the clip may fall out. Looks like these: