AR15 Mossy 590A1 stock adapter

Ok, I've found 2 such items that allow the installation of an AR15 stock AND allow the AR15 grips to be interchanged. Most AR15 shotgun stocks that I have found do not allow this part, and I do not like the quality of the permanent pistol grip. The problem is that these two are EXPENSIVE as hell. If anyone can find some, with or without the optics rail, please let me know. Here are the two I've found so far:
Cavalry Arms SST-590 for $250.00
Mesa Tactical for $150.00 or $125.00
(by the way, what do they mean by loaded high-tube on this link?)
The Mesa model seems more versatile, and they do have a picture of the adapter without the rail. I will have to give them a call.
 
Knoxx SpecOps

The Knoxx SpecOps offers the benefits of the AR-15 M4 design without many of the negatives. You can use the factory sights, bead or optics. (Not possible with the "High" stocks due to the height of the stock which required elevated sights.) In addition, it features two recoil reducing systems so that felt recoil is almost zero. See videos at www.knoxx.com
 
I handled and shouldered the Mesa version at a gun show. Real nice product in terms of quality and the way it makes the gun feel.

I would've bought one, but the gun it'd be for on my end would be a Mossberg, and the tang safety isn't really "correct" for an AR-style grip. The crossbolt safety of a Remington 870 would be better. So to build the gun the way I'd want it, I'd have to buy a new 870 and dump a few hundred on it to get the setup I want. Which is going to have to wait until I add another two 1911s to the collection.

Other than that, I wouldn't hesitate to buy Mesa's product.
 
Mesa Tactical's "high tube" is used when one puts some type of optics, such as an Aimpoint or EOTech on the rail. The "low tube" kit is for standard sights or bead. We've tested both extensively for S.W.A.T. Magazine and would not hesitate to recommend them.

We also have an article coming up on the Knoxx unit, and it also appears promising.

Denny
 
I going with the Knoxx Spec Ops stock. I like function as well as design, this seems to foot the bill. I like price at $130.
I cant see dropping another $250 on a stock for my 870 that only cost me $300 for the whole dang gun.
 
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