I just got a Remington 870 Home Defense (synthetic stock and 2 shot mag extension) and the manual doesn't really address several issues. At what point do you need to remove the barrel clamp/band, or do you even have to remove it to disassemble the gun? When I unscrew the mag cap, does it slide over the end of the mag extension or does the entire assembly come off? I have watched several videos, and searched several forums, but I haven't found the specific answers to my questions yet. Also, does anyone know of a way to change the front handguard without a special tool? Thanks in advance if anyone can provide any info, pictures, videos, links, etc.