Knoxx stocks, perhaps?
cyclone is on to something here I think.
Found this on the highroad forum.
http://www.thehighroad.org/showthread.php?t=185747
Knoxx SpecOps stock: initial review
I purchased one of these stocks and installed it on a Remington 870 Wingmaster with 20" IC smoothbore barrel (with rifle sights). I wanted to try it for two main reasons:
1. Having had two years of back surgery for an on-the-job injury, I've been left partially disabled, and heavy recoil is Not A Good Thing as far as my back is concerned;
2. I teach disabled and handicapped shooters, and many of them in wheelchairs or dependent on walking aids can't handle the recoil of a "normal" shotgun, even with low-recoil loads. I've tried using a standard Knoxx Compstock for them, but the LOP is just too long, particularly for wheelchair users. I wanted to see whether the adjustable length and recoil absorbtion of the SpecOps stock helped them.
Something like 200 rounds have gone downrange with the SpecOps stock so far, fired by myself and three disabled shooters (two in wheelchairs) who helped with the testing. As the SpecOps is primarily oriented towards defensive shooting, we used buckshot and slugs, both full-power and reduced-recoil, for our tests. (I see no reason why it shouldn't work perfectly well for trap, skeet, hunting, etc.
Subjectively, I'd say that this stock takes at least 50% off the recoil. In my hands, full-power 12ga. slugs (Rottweil Brenneke, Remington Slugger) feel even softer in recoil than a a low-base #8 birdshot round. I'd rate the felt recoil as equivalent to a 7.62x39mm. round fired from a Yugo SKS - entirely manageable, and nothing unpleasant. I suspect that a 3" magnum load would feel a bit like a reduced-recoil slug or buckshot load, but I haven't yet bothered with magnum rounds.
My disabled friends particularly appreciated being able to set the length of the stock to suit themselves. Both guys in wheelchairs set it to one notch out from the shortest position, giving a LOP of approximately 11¾", and found that this was very manageable from their seated position. The other shooter, using a walker, found a mid-length position most comfortable, as did I - LOP about 12½". We all found that the thin hard rubber butt pad was not the world's most comfortable, but given that the recoil was much reduced, this wasn't a major problem. I plan on replacing it with either a Kick-Eez or Limbsaver pad for even better recoil reduction.
Overall, I'm very impressed with this stock. It's certainly going to stay on my HD-oriented shotgun, and I'll probably buy one of the CopStock wire-framed folding stocks as well, just to play with it and compare them. (Given that they both use the same recoil reduction mechanism, I expect the "feel" of the recoil to be similar: but the wire-frame stock doesn't have the same solid pad as the SpecOps, so I might have to rig up something to spread the recoil a bit.)
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There are two recoil reducing devices in the SpecOps. One is in the pistol grip and the other in the butt stock. Pulling the stock tightly against your shoulder preloads the secondary mechansim and reduces its effectiveness. It also tends to increase the intensity of the little recoil that makes it past the grip mechansim. After thousands of rounds of testing we have found that the best method is to set the stock gently against the shoulder and let the mechansims do their work. It takes some practice to overcome the old habits but it is worth it.
