Midwest Industries Rail System for Smith & Wesson L Frame
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TANDEMKROSS has delivered on our promise to ourselves and our customers: offering yet another top-notch product at a great price to solve real users’ problems to make a good gun great. The journey to release the #TANDEMIZED “Kraken” for Ruger® Mark IV™ and Mark IV™ 22/45™ has been an exciting year in the making and is now officially here.

What was once a stripped grip frame perfect for skilled tinkerers and advanced DIYers is now a fully assembled, accessorized, and upgraded drop-in lower ready right out of the box. If you can turn a screwdriver or change a lightbulb, you can confidently install your Mark IV™ or Mark IV™ 22/45 upper to a brand new #TANDEMIZED “Kraken.”
If you don’t already know, to be #TANDEMIZED is to have something fully customIZEDwith TANDEMKROSS parts. This means the #TANDEMIZED “Kraken” Lower has all the same crucial advantages over the factory grip frame, but now with the added benefits of every part TANDEMKROSS has that can be installed on a Ruger® Mark IV™ 22/45™ grip frame. From top to bottom, everything in and on the #TANDEMIZED “Kraken” is from TANDEMKROSS.
The #TANDEMIZED “Kraken” is available in customers’ choice of color for the frame and accessories allowing them to make their pistol truly unique to their personal preference. This deluxe upgrade comes with all the following products fully assembled and installed by our in-house experts:
Purchasing all these parts separately quickly adds up to well over the starting MSRP of $599.99 for the #TANDEMIZED “Kraken” and would still require the time and skill necessary to install everything when it arrived. Getting the fully assembled “Kraken” gets you immediate savings in time and dollars with the confidence that every part on the new lower for your Ruger® Mark IV™ or Mark IV™ 22/45™ was properly installed by a skilled and trained professional.
With everything already assembled and installed, the newly #TANDEMIZED “Kraken” can interchangeably host factory or aftermarket uppers for either the Standard Ruger® Mark IV™ or the Mark IV™ 22/45™. Anyone previously deprived of experiencing the pleasure of shooting or owning a 22/45™ now only needs this and to convert their magazines by replacing the Mark IV™ base pads with Mark IV™ 22/45™ base pads (like TANDEMKROSS’s “Tomahawk” or “MarkPRO” Magazine Bumpers).
Bryan Haaker, Co-Owner and Co-Founder, had this to say about the latest release:
2 years ago, we saw a market need and took the rope of responsibility of developing our largest and most complicated product to date. There was sweat. There were tears. Hopefully there was no blood except in the metaphorical sense! On Saint Patrick’s Day, March 17, 2022, we finally reached our goal. We provided the market with the most reliable, most ergonomic, and most beautiful lower for the number one .22LR hand gun in the market, the Ruger® Mark IV™ 22/45™.
The #TANDEMIZED “Kraken” for Ruger® Mark IV™ and Mark IV™ 22/45™ is an absolute must-have for anyone looking to make their good gun great.
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