870s, 1100s and most vintage pump guns are cast neutral. Modern designs often come with shims the fit between the receiver and stock to adjust cast. I suppose an enterprising person could 3d print a shim for an 870, but not sure the market would support the effort.

I mean, you could shim the stock/receiver joint on the left side with a piece of cardboard to see if it works for you. If it does, cut about the same thickness off an old kydex holster and glue it in place. Sand flush with the wood. Cut up an old credit card and stack to any thickness you need.

 

If you just need some offset I would try an adjustable comb. Remingtons are pretty slim in the comb, and while I need quite a bit of offset in a sporting gun, I’ve always line up 1100’s easily.

 

https://www.shotgunworld.com/threads/remington-870-stock-bearing-plate.583357/?post_id=5223406&nested_view=1&sortby=oldest#post-5223406

 

One might be able to trim the wood a bit on one side to get some cast. I know stock makers have done this with o/u guns. Trim the right side to get some cast off.

 

If you're going to try making your own shim, or stock bearing plate as jerposer's post outlines, keep in mind that the hole the stock bolt goes through is not made for adjustment and you will have to make some room inside the stock to allow the stock to be angled off the 'shim'. It seems to me that the front/receiver end of the stock also is inletted, but it's been a while since I had the stock off my 870. If it is, this will also make your modification a bit more complicated. (faced with a similar situation, I bought a new gun that came with shims, and it's worked out very well for me, though I miss hunting with my 870)

 

True. "Also I used some kind of grinder (probably dremel) to widen the stock bolt hole to the left. Now the stock at the front has a left side space, the stock is cast to the right, and the bolt is straight out from the receiver and offset to the left at the bolt hole.". Also I use some half circle washers on the right of the bolt to gently push it to the left during tightening.

 

Years ago, I made a shim for my 870 using a Formica chip (laminate color samples always found bead chained together). I double stick taped one to a 'holder' scrap and face sanded the taper using a disc sander. I think I orientated the taper direction so it added a little cast off AND reduced drop before cutting the outside profile. It worked perfect and is easily reversible.

 

My instructor did a fit for me. I use a slipon comb raising kit on the stock. Cast w the shim.

 

Oops

 

Your only option is to find a used custom stock or have one made. Once upon a time there was after market synthetic stocks for the 870 that had adjustable combs. The slip on combs with shims would probably work to some extent.

I've heard of people bending stocks with heat and moisture.

Bottom line, it's an 870. You can spend more money than what the gun is worth to make it what you want. Or you can buy a dedicated gun that does what you need out of the box.

 

The statements "your only option" and "would probably work" and "or you can buy a dedicated gun" are inaccurate. There are adjustable stocks (drop, cast) for the Rem 870, almost cost as much as the gun. My instructor did a fit on mine and recommended a local gunsmith to put an adjustable system for cast/drop, would have cost as much as the replacement-type adjustable stock.

I made a shim for cast, and use a slip-on comb. Both work for POI and POA, both work the same as the cast/drop for my Beretta A400. The drop/cast issue has been discussed on SGW several times. The slip-on comb was $25, the shim was made from a piece of scrap plastic and my Dremel tool.

https://www.shotgunworld.com/threads/remington-870-stock-bearing-plate.583357/?post_id=5223469&nested_view=1&sortby=oldest#post-5223469

e.g.

https://www.shotgunworld.com/threads/how-to-raise-the-comb-on-an-870.495324/

see above for shim
google "slip on comb for rem 870".

 

I have one of these for the 870: Jack West Stocks

I'm not using it now & might sell it, if interested, PM me

 

Thanks for the offer. I looked at these when I was doing my fit. They were about half the cost of the gun. I went with the $25 slipon comb and the shim.

Be careful about sales offers. I think my posts were deleted when I even hinted that I might give away or sale something

 

Adjustable buttplate works well.