Mod 870 Stock Modification

[Virginian]

I have. I did it by hand in stages. You will need some washers or a spacer under the nut on an 1100 because the action tube is also longer than the 870 stock bolt. Hard to get light washers big enough on the inside and small enough on the outside. In my opinion it's easier to make an aluminum spacer.

[tudurgs]

If you are putting a trap-dimensioned stock on a standard gun, you will change the drop at heel, and will raise the point of impact versus the skeet/field gun.

[Virginian]

Check eBay. Prices have gone up since I picked up a perfect 1100 set for $53, but they have a wide selection, and pictures.

[Virginian]

Gads ! That one must have some gold in that extra hole in the back. That is an 1100 Magnum stock for a second generation (1979-1989) Model 1100. Nothing "High Grade" about it other than Remington's usual good wood. I got one that looked that good without the recoil pad in first generation pattern in that $53 set I mentioned. Before everyone caught on, you could really find some deals on there.

[Virginian]

Trap stocks have less drop. If you put it on the gun and it has 2-1/2" drop at heel it is not a trap stock. Hard to tell by looking. That is a nice first generation stock in any event.

[Virginian]

With the nut snug, what's your drop at heel?

[tudurgs]

Shown below is a description of Drop written by Morris Hollowell:

"Drop - The distance from an imaginary straight line of sight extended along the rib of a shotgun rearward towards the butt---to the top of the stock at the comb or the heel. (In British: Bend). The amount of drop determines how high or how low a gun will naturally point. Browning, in its infinite wisdom, considers that 2 3/8" drop at the heel will best fit the broadest range of shooters for field use. This measurement can therefore be considered "normal." A gun with less drop will shoot higher, while a gun with more drop will shoot lower for a given individual. When the gun is comfortably mounted with the cheek snugly on the comb, the drop is about right when you can see the front bead and just a little rib over the standing breech. Trap guns usually have less drop because they are supposed to shoot a little high in order to hit an almost universally rising target. Standard wisdom indicates that the drop is about right for a mounted trap gun when the front bead seems to rest just on top of the middle bead like two parts of a snowman, or forming a figure-eight."

To measure drop, lay a straightedge on the rib, extending back over the stock. Measure the distance between the straightedge and the top of the buttplate or recoil pad. Trap guns will have less drop (in the range of 2") whereas field guns will have maybe 1/2" or 3/4" more drop

[Virginian]

Okay, then that's a standard Remington 1100 stock, not a trap stock. Remington considers 2-1/2" "Normal". The only way to close that gap may be to remove some wood at the bottom of where it mates with the stock. It apparently was made that way, and wrong if I do say so, because Remington stocks should interchange and fit with no issues. But, since you are putting an 870 stock on an 1100, first thing I would do is open up the hole for the action tube; that might well solve things. I guess you already know the action tube is not a tight fit on an 1100.
The other alternative is to remove some wood where the stock meets the receiver. If you do remove some wood, and the finish, be sure and seal the open wood pores when you are done. You can probably do it with a sanding block, just use relatively fine, say 200 grit or smaller, paper and smooth even strokes until you get the fit you want. A couple of final passes with 400 grit at the end. You want to change the angle of the whole mating surface.
Good luck.

[tudurgs]

Be careful when sanding the stock to fit. In gross terms, if the gap you are describing is 1/16", the stock is 1 1/2" top to bottom at the receiver, and is 14" long, you could raise the drop at heel by somewhere around 1/2".

[Virginian]

Have to disagree tudurgs. He will not be changing the angle at which the stock meets the receiver by rotating the stock down, he will be altering the stock to get a good match fit at the same angle of intersection.
Now if he drills out the stock hole, he may get a little extra drop. I have never seen this exact issue in all my years playing with them.

[Virginian]

Mahogany stock? Okay, now it is definitely confusing. How many different stocks are you trying to put on how many different guns?
Mahagony stocks only went on 20 gauge 1100s to the best of my knowledge, but the full sized 20 gauge 1100 stock and fore end could have been modified to fit a 12 gauge I guess.