#TANDEMIZED Kraken for Ruger® Mark IV™ and Mark IV™ 22/45™
#TANDEMIZED Kraken for Ruger® Mark IV™ and Mark IV™ 22/45™

#TANDEMIZED Kraken for Ruger® Mark IV™ and Mark IV™ 22/45™

Part Number:TK26N0461
Average Rating
Your Price: $599.99
In Stock

Choose Options

“Kraken” Frame Color
Accessories Color
Add an “Accelerator” Forward Thumb Ledge

HOLIDAY HEADS UP: Due to the large volume of holiday orders and this product being custom built to-order, orders for this product placed after December 1 will NOT be completed or delivered in time for Christmas Day. We are still accepting orders while supplies last, but most recent orders just entering the assembly queue will have estimated completion/delivery dates for after Christmas.

At a Glance:

  • Fully metallic lower replacing factory plastic

  • Fully assembled and upgraded with all TANDEMKROSS parts and accessories

  • “Drop-in” ready out of the box

  • Not serialized! Does not require an FFL

  • Compatible with virtually ALL factory or aftermarket Ruger® Mark IV™ and Mark IV™ 22/45™ uppers

The #TANDEMIZED Kraken is the single best way to get the most out of your Ruger® Mark IV™ Standard or 22/45™ pistol. What was once a stripped lower that required additional parts and assembly is now ready to host your pistol’s upper right out of the box! Increase the life and durability of your pistol while also increasing its reliability and performance!

TANDEMKROSS’s Kraken boasts an enlarged trigger guard for large or gloved hands, a hooked trigger guard for more points of contact, and textured backstrap for improved grip and ergonomics. Additionally, the takedown button has been replaced by a single takedown screw that helps preserve the pistol’s simple takedown while reducing play between the lower and upper for a firm, secure hold. The cerakoted aluminum is also much less susceptible to damage from heat, chemicals, impact, or general wear and tear.

Since all Ruger® Mark IV™ Standard and Mark IV™ 22/45™ pistols share the same one-button takedown feature, the Kraken will support virtually any factory or aftermarket Ruger® Mark IV™ or Mark IV™ 22/45™ uppers. This means the Kraken allows you to easily turn any Ruger® Mark IV™ into a Mark IV™ 22/45™. All you need is to swap out the factory Mark IV™ magazine base pads with Mark IV™ 22/45™ base pads. TANDEMKROSS’s extended magazine bumpers perfectly fit the bill! Try either the “Tomahawk” or “MarkPRO” Magazine Bumpers that both come in packs of two.

This upgrade contains over 30 parts, components, and accessories, all from TANDEMKROSS and all fully installed, assembled, tested, and ready to go as soon as it arrives at your door. Whether for serious competition or recreational plinking, the #TANDEMIZED Kraken is perfect for anyone looking to improve their favorite rimfire pistol.

With the #TANDEMIZED Kraken you’ll receive:

Choose your favorite color Kraken and all black or all red accessories! Plus, by choosing to add an Accelerator Forward Thumb Ledge to your #TANDEMIZED Kraken you’ll save $10!

Get the #TANDEMIZED Kraken for your Ruger® Mark IV™ or Mark IV™ 22/45™ today and make your good gun GREAT!

Your #TANDEMIZED Kraken is built to order and may require some extra time to assemble by our in-house customs shop. Please allow for as many as 3–4 weeks for full assembling and processing.

Don’t forget, all TANDEMKROSS products are made in the USA and come with a LIFETIME guarantee!

INTERNATIONAL CUSTOMERS: Because the Kraken is a frame, it is NOT available for direct international sales.

IMPORTANT: This product complies with ATF RULING 2009-2

Any person who installs “drop in” replacement parts in or on existing, fully assembled firearms does not manufacture a firearm and does not need to be licensed as a manufacturer under the Gun Control Act. A “drop in” replacement part is one that can be installed in or on an existing, fully assembled firearm without drilling, cutting, or machining. A replacement part, whether factory original or otherwise, has the same design, function, substantially the same dimensions, and does not otherwise affect the manner in which the weapon expels a projectile by the action of an explosive. Any person who is licensed as a dealer, which includes a gunsmith, and who installs “drop in” replacement parts in or on existing, fully assembled firearms as described in this ruling does not need to be licensed as a manufacturer under the Gun Control Act. Any person who is engaged in the business of installing “drop in” replacement parts in or on existing, fully assembled firearms as described in this ruling must be licensed as a dealer, which includes a gunsmith, under the Gun Control Act.

This item is NOT considered an “80% Lower” and Complies with Rule 2021 R-05F

Grandfathers in existing classifications of frames or receivers (to include split frames or receivers) and allows them to be marked in accordance with the existing requirements.

The full definition can be found here: https://www.atf.gov/rules-and-regulations/definition-frame-or-receiver/summary

This product is NOT a serialized part.

WARNING: This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov

5 Stars
I have been shooting my Kraken weekly for a month now. I really like how it feels in my hand, the ledges and trigger guard configuration are great. The mag release works very well also. I've tried 3 MKIV uppers without issues. The trigger pull is very light. So far I'm very happy with my Kraken!
Did you find this helpful?  5 of 5 Found Helpful
Reviewed by:  from Massachusetts. on 4/16/2022
5 Stars
Just received the Kraken. It is wonderful! I mounted a Volquartsen barrel and bolt to make a great pistol. I had a couple questions and Tyler answered them immediately. I’ve been dealing with Tandemkross for many years. It has been a real joy!
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by: (Verified Buyer)  from Martinsburg, WV. on 6/27/2022
5 Stars
Kraken Complete Lower
As a long-time admirer of the Ruger Mark Series I had it in my head to finally make the leap. Thanks to previous experience with Tandemkross while upgrading other pistols I was positive the Kraken would be everything I hoped for in turnkey fashion, and TK did not disappoint! The Kraken just feels like a whole other pistol when compared to an OEM lower. Comfortable with ergonomic controls, beautiful machining, and finish. Trigger pull weight is superior, the shoe itself is comfortable. I could gush for days! Despite the step up in price the case can be made that [TK]’s all in one solution is a far better bargain than a factory Mark, particularly if you’re looking to upgrade your barreled upper with an aftermarket. First range outing was outstanding, far exceeding my already heightened expectations. If you find yourself at a crossroads while in want of a Mark IV, do yourself a favor and order a Kraken.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Iowa. on 5/2/2022
5 Stars
Exactly what I had hoped... a competition ready frame, out of a box...the balance is perfect and the trigger pull is light with a nice little take-up... and that trigger guard! Very handsome
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Reviewed by: (Verified Buyer)  from Nj. on 11/6/2022
5 Stars
Tandemized Kraken is a Winner
This lower is outstanding! Every item on it is superb. Most important, it makes shooting so much better. The trigger is about 1.9 lbs! WOW! Buttons are a litter larger and very easy to reach. All in all, this is a superb lower for the Ruger Mark IV 22/45 Lite.
Did you find this helpful? 
Reviewed by:  from Eugene, Oregon. on 10/29/2022

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