Check Remington's web site - I think they have some info on their old/obsolete/discontinued guns, including the Model 11.
Also, check this out:
Go to
www.duckhunter.net and choose the "Shooting-Reloading Forum" on the left side of the screen. The second topic is called "Lesson 2 the Browning A-5." This topic has a series of detailed instructions, inlcuding nice photos, of how to take apart and reassemble an A-5.
Since the A-5 and the Model 11 are essentially the same gun design-wise, this will probably help. I think the guy who posted that mentions some of the differences between the A-5 and the M-11, too. Pay attention to posts that deal with A-5s, because most of what you see there will apply to the M-11s also.