Hi Mike! Good news..I think...
I just got an email from Blackhawk and here's what they said...
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Marc,
Thank you for your interest in ATK/BLACKHAWK! and our Knoxx line of stocks. Our Knoxx SpecOps Adjustable shotgun stocks for the Mossberg line of pump shotguns are designed for the 12 gauge model.
There were some instances where Mossberg used the same receiver on the 20 gauge as the 12 gauge; so the stock would work on those. The problem lies in the fact that there is no way of knowing (serial number, model year) if your 20 gauge has the same receiver as the 12 gauge or not. We find aprox. 60 to 70 percent fit. Please let me know if you have any questions, and I will be happy to assist.
Best regards,
John B. Brantley
Knoxx Technical Support / LE Customer Service Representative
ATK Accessories – BLACKHAWK!
ATK Security and Sporting
6160 Commander Parkway
Norfolk, VA 23502-2052 USA
Office: 800.694.5263 x3243
Fax: 888.830.2013
Email:
john.brantley@atk.com
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"HONOR. As A Way Of Life."
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So..I if you can figure out if you your receiver is the same as some 12g, then you're in luck. Maybe go to a gun shop and ask if you can check them out to see if your stock fits theirs. trial and error.
Also..if you'd like to send O.F.Mossberg an email asking them what fits what, then here's their addy...
(800) 363-3555, fax (830) 773-5893, or email
service@mossberg.com
let us know how it turns out!
cheers!!