Remington 870 Wooden Stock - Stampings & Proof Marks

[spcsys]

Does anyone know of a good page where I can find information on Remington wooden stock proof marks or stampings? I am looking specifically in regards to an 870 but I am sure if someone took the time to compile such a list they would be more comprehensive and cover all of Remington's models. If so, thank you for the link, if not, please see if you can help me with determining the meaning on the "20" on a stock I am purchasing to build up an old retro parkerized 870 once I get a nice parkerized receiver.

Here are the details on the stock in question:

I purchased a Remington wooden stock which was sold as a Police/Riot stock. Everything looks good but there is one concern which is a stamping. The stock is stated to be for a 12 or 16ga (by the seller). That sounds right but the stampings are as follows, it has "870" (no P) on the area that attaches to the receiver (not sure what that flat area that interfaces the receiver is called). What has me thinking is that under that area, where it has the trigger guard gap (unfinished area) it has "20" stamped on it. I don't have an 870 receiver available to me to verify if it is a 12ga compatible stock.

I wanted to ask if anyone has any information to share with me regarding this stamping or the size interchange on the 870 gauges. Is it possible this stock shipped with a 20 gauge but on a standard 870 receiver frame the 12/16/20 gauges would use the same stock interface/sizing?

Thanks for any information you all can provide. I can show a picture if that would help, the listing is currently still on ebay as well but I am not sure if I can link to the item number, besides the listings expire over time and I know the dead links don't help people down the road. I searched Google but could not come up with anything as "stampings" returns all barrel proof mark results due to the high number of forums having had those questions asked over the years.

Thanks,
Sean

Also, if this is the wrong section please let me know.

[Synchronizor]

Early 20ga 870s were built on the same large receiver size as the 16 & 12ga guns. Later on, Remington switched the 20ga models to the new lightweight receiver size also used for 28ga and .410 models. All large- or small-receiver stocks are interchangeable, so if the stock you bought was off an older large-frame 20ga, it'll fit your 12ga just fine.

If you're replacing a synthetic stock, make sure you have a stock bearing plate on-hand when you install your new wooden stock. It may also require a different stock bolt, depending on what year it was manufactured.

Detailed information on 870 stock sizes, bearing plates, fasteners, and removal & installation can be found in this video.