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Hope you did not loose any parts. Take it apart again or take it to a gun smith. I would take it apart again first. you might also want to sweep the area with a magnet like the ones from the builder supply store, before you vacuum. you might just find a missing clip, spring or pin.
Should not be happening, as both hammers should be cocked as the receiver is closed. I would disassemble and reassemble the shotgun barrel to receiver. Here is a link to the owner's manual: http://media.winchesterguns.com/pdf/om/06_361_select.pdf Perhaps when disassembled, you will discover a cocking rod is binding, bent, or something. I really can't guess what it could be.
Remington Year of Manufacture Codes maybe found on the barrel of your Remington rifle [or shotgun] on the left side, just forward of the receiver; the first letter of the Code is the month of manufacture, followed by one or two letters which are the year of manufacture. For shotguns with removeable barrels, the code will be valid for the manufacture of the barrel; maybe for the receiver, as barrels do get switched around.
According to the "Blue Book of Gun Values", the coding continues as follows:
Month Codes: [first letter] B - L - A - C - K - P - O - W - D - E - R - X 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12
Year:______Code: [second (and third*) letters] 1930_______ Y 1931_______ Z 1932_______ A 1933_______ B 1934_______ C 1935_______ D 1936_______ E 1937_______ F 1938_______ G 1939_______ H
1940_______ J 1941_______ K 1942_______ L 1943_______ MMZ 1944_______ NN 1945_______ PP 1946_______ RR 1947_______ SS 1948_______ TT 1949_______ UU
1950_______ WW 1951_______ XX 1952_______ YY 1953_______ ZZ 1954_______ A 1955_______ B 1956_______ C 1957_______ D 1958_______ E 1959_______ F
1960_______ G 1961_______ H 1962_______ J 1963_______ K 1964_______ L 1965_______ M 1966_______ N 1967_______ P 1968_______ R 1969_______ S
1970_______ T 1971_______ U 1972_______ W 1973_______ X 1974_______ Y 1975_______ Z 1976_______ I 1977_______ O 1978_______ Q 1979_______ V
1980_______ A 1981_______ B 1982_______ C 1983_______ D 1984_______ E 1985_______ F 1986_______ G 1987_______ H 1988_______ I 1989_______ J
1990_______ K 1991_______ L 1992_______ M 1993_______ N 1994_______ O 1995_______ P 1996_______ Q 1997_______ R 1998_______ S 1999_______ T 2000_______ U 2001_______ W 2002_______ X
* the years 1943 though 1953 had double letters: ie, MM = 1943
As maybe seen, the year code letters duplicate; some knowledge of when the model was introduced should resolve the actual year of manufacture.
Remington owners: COPY this table to your Hard Drive......! !
Both models 1100 and 1187 have a variety of replacement barrels available for them. They are fairly common. Can't help you with the date but Remington is an outstanding firearms company to deal with. Try their website.
If you absolutely MUST clean this.Take the buttstock OFF.Put the receiver in a can of mineral spirits and use a small paintbrush to get the gunk out.If your inertia mechanism is misbehaving(won't fire 2nd shot,) you can often fix it with a liberal application of spray .lube, such as WD40 or RemOil,Good luck
Should take it to a gunsmith, but if you want to loosen it yourself, get some spray gun cleaner, or even gun oil (light) and put it inside as much as possible, keeping in mind that it may be loaded with a stuck cartridge(point in safe direction at ALL times). Loosen with the lubricant, open action up and inspect throughly. If there is a cartidge in it, discard safely, as the lube may have ruined it and an old cartridge may be unsafe. If you can get the action open, try to clean out possible corrosion with swabs and q-tips soaked in the lube. Depending on how it was stored all this time, you may have to disassemble and lube more completely. Google the name and model number to try to find diagrams or assembly help.
The best thing is to take it to an "old-timer" who is familiar with older shotguns and have them inspect it, or take it to a gun show or shop.
Treat it as Loaded until you can prove otherwise by opening the action! DO NOT ATTEMPT TO FIRE!