stocks are the same for any model 12 or 121, try e-gunparts.com or watch on gunbroker.com.
There are people making them new as well for example
http://macongunstocks.net/remington_model_12_or_121_2_piece_riflestock_96.html
http://www.gunstocksinc.com/web_pages/Plate-pics/Remington-Stocks/Remington-Rifle-stocks.htm
You can also try e-bay. Keyword Remington Model 12 and see what you might find.
Remington didn't make a Model 12-2 but Model 12-A-F & and CS. But the value is GREATLY dependent on condition without that it's anywhere from a 200-1,200 gun NIB.
Which model 12-a, 12-b, 12-c, 12-cs? But it's mostly about original condition, condition, and condition. Without that it's 100 - 1,500.
Well you can't asked when it was made based on the serial without providing it!
Sounds like you talking about a Remington Model 12-A and a 12-CS. 12-A - 1911 12-CS - 1917
1924 It's date codes on the barrel see related links for information on the Remington Society of America.
Remington made neither a shotgun or rifle model 1890, sounds like you are might be talking about a model 12-C or 12-CS pump rifle. Until it's identified correctly and a GOOD description of it's condition, valuation is impossible.
None of them say. 22 short, long, or long rifle round barrel 12-A octagon barrel 12-C 22 short (octagon) 12-B 22 Remington Special (octagon) 12-CS
They are always selling reproduction manuals on e-bay for 5 bucks or so.. I should put one online on the Remington Society when I get a chance....
I'm guessing your talking about a Remington model 12-CS pump?If so it was made in early 1915.
Unmarked that would be a Model 12 (-a,b,c,d,e,f,cs) depending on barrel type, ammo, etc, made in 1919.
Remington firearms are dated by using a 2 or 3 LETTER code stamped on the barrels, not by a serial number. This is a link to the Remington Collector's website showing the letters and their location on the barrel. Good luck! https://www.remingtonsociety.org/manufacture-dates/
12-cs? 22 Rem (WRF) not 22lr? Depends greatly on condition, but unless it's excellent to mint probably not a lot over 300-400.