Offered for sale are like new Knoxx recoil reduction adjustable stocks for Mossberg 500 or 590 12 gauge shotguns. These were purchased used, but appear like they have not been installed. Stocks have tight lock up and fresh Knoxx buttpads. These are the first generation stocks that are hard to find. This is not the same as the NRS, as those do not offer recoil reduction. These have a spring and weight in the buffer tube portion to reduce felt recoil. 

Great option to short barrel your shockwave with the $0 tax stamp. 

I have a couple available. $40 west Wichita meet up. 

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