It's a Chinese made knock off of a Remington 870. As for the rim of the shell base catching, you need to get used to centering your shot shells more as you load the magazine. Have you tried to simply clean the magazine tube of crud an gunk, such as preservatives. So this with the spring and follower out and, of course, the gun unloaded.
After cleaning the magazine, take a good luck to see if there are any burs or spots that seem to be rubbing on anything. Drop the follower down the tube and see if it falls freely. turn the gun muzzle down and see if it falls out.
With the action assembly and forend removed, lay a straight edge up against the outer wall of the magazine tube to check for any dents or bends in the tube.