Double O-Ring for Remington 1100

[chas08]

Its hard for me to tell from the photos but the piston rings stack with the flat side toward the action, and the contours toward the muzzle. One concave and one convex nestled together. The o-ring goes on last, and if memory serves correctly, fits into a slight groove on the magazine tube and does not actually move when the gun is fired. I no longer own an 1100 but I still do have an 1187 and that is how it is on it.

 

[kle]

yeah, I figured that much out; had I installed it the other way (contours towards the action), I probably would've broken something on the first shot =)

I posted the pictures to illustrate what I was trying to explain to mnrivrat: The 'old' style piston/seal system is two parts that are definitely two separate pieces, while the "new" style is two parts that snap into each other and become one 'assembly'. I was saying they seemed 'backwards' because the angled faces are reversed in the 'new' style. Obviously, it still works, but it just seemed backwards.

 

[Virginian]

I like older 1100s. Keep it clean and it won't let you down. I spray the gas system with RemOil after cleaning, and then wipe off the excess. I used WD-40 for probably 25 years before a lot of people decided WD-40 was something evil, with absolutely no ill effects. (Admittedly, WD-40 is not a great lubricant)
To figure out your manufacture dates, assuming the barrel is original to the gun, check here:
http://www.remingtonsociety.com/rsa/questions/barrelcodes

 

[kle]

I believe the barrel is original to the gun, although I bought it used (and the guy I bought it from bought it used, too), so no guarantees.

At the very least, my barrel was made in December, 1977, which makes it 5 years, 6 months older than me =) Thanks for the link!

 

[Virginian]

Apropos of nothing, I have never had an 'O' ring fail. I have replaced a couple that started to look ratty in 5 1100s and 45 years. Uh, better make that 4 1100s and 30 years because the senior member has a metal 'O', no, actually it's a 'V' ring. Both of those that got a little fuzzy were on guns that got soaked and got pulled apart and shaken out and/or wiped off and then put together without any anything on the magazine tube, and I could feel the 'O' ring drag when the gas piston shoved it back up into the barrel ring/magazine tube gap the first time.
I have a bunch of spares, that do not look like they will ever get used, mostly bought from Green Top Sporting Goods on U.S. 1 North of Richmond, VA over the years. They used to keep them in a drawer compartment in one of the cash registers. All of them have the light graphite coating Remington put on them, and not one has even begun to dry out. They live in my gun cleaning box for 8 months a year, and then for 4 months two of them live in my wallet. I think they must be neoprene or some other pretty decent synthetic compound.
If you have persistent problems, I haven't a clue what's wrong.