Great! I think you'll really enjoy it!
Yes, I do have a couple of things to point out that might make your life a little easier. Obviously, read the manual from end to end, then go after a complete take-down and cleaning right away. Do the full take-down too, including removing the trigger assembly. Of course, leave the trigger assembly intact, but do clean out all traces of packing grease from it. I find that a spray can of Remington Action Cleaner, along with Q-tips and old tooth brushes does a great job. After a final spray down, let it dry, then give the entire assembly a light shot of gun oil, like Remington's Rem Oil spray.
Clean the barrel too - shouldn't be too dirty obviously, but you'll want to run some patches of Hoppe's cleaner down there, followed by some scrubbing with a brass bristle bore brush. Couple of clean patches afterwords to get the crud out, along with a final patch lubed with a little oil and it's all set. Oh, be sure and remove your choke at each cleaning too - clean up the threads on both the choke and the barrel, then give the choke threads a quick shot of Rem Oil.
Do dismantle the bolt assembly along with the firing pin assembly as the manual indicates too. It's so dang easy to do. Go ahead and clean all the parts with some Hoppe's and follow it up with a light shot of Rem Oil.
Now, one REALLY important thing about the 1300 20 gauge (as I mentioned earlier). The bolt assembly MUST be removed from the opening provided when the trigger assembly is removed. It will actually come out of the bottom of the action. NEVER try and remove the bolt assembly from the front of the action assembly by yanking on the forearm/slide-arm assembly! Doing so WILL bend or break the small pin mounted into the inside of the frame that guides the ejector rod (part #24). When you go to remove the bolt assembly, make sure and look down there at that ejector rod and look at how it's mounted - when you remove the bolt those parts will free up and drop out of the action. Easy to put 'em back in, if ya see how they went in to begin with.
And finally, an oddity (at least I find it odd). As the manual states, the proper stages of reassembly is to attach the barrel & forearm/slide-arm, bolt assembly, THEN the trigger assembly. You can do it the opposite, but doing so is more difficult because of the way the way the tip of that ejector rod sticks out of the breech area - kinda' makes getting the barrel installed a little difficult.
Okay, I'll shaddup' now... :wink: