Review: TandemKross Manticore X

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posted on October 21, 2025
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TandemKross Manitcore X

In 2024, TandemKross (TK), best known for its high-quality competition upgrades for rimfire platforms, launched the first ever lower-receiver assembly designed for the rimfire Ruger 10/22 platform. Dubbed the Manticore X, it provides a set of features and configuration options unavailable with the typical trigger groups and stocks made for this popular semi-automatic platform. In most cases, a 10/22 trigger group’s polymer or aluminum housing supports the carbine’s trigger guard, trigger, fire-control group, external safety button and magazine-release mechanism. The trigger group is secured to the serial-numbered receiver using two cross pins that are held in place by setting the action into either a shoulder stock or chassis system. Once the action is secured to the stock using the takedown screw, the carbine is ready to fire.

The CNC-machined aluminum housing of the Manticore X fills the same mechanical roles as the usual 10/22 trigger housing, however, it has been extended and modified to take the place of a stock, much like the lower receiver of an AR-15 rifle. In addition to its fire-control group and external controls, the Manticore X supports the magazine and provides a mounting position for removable and interchangeable AR-15 pistol grips. At the rear is an extension that supports a short Picatinny rail section for attaching either fixed or folding shoulder stocks. The hardware supplied with the Manticore X includes a set of cross pins with ball detents that secure them into the receiver.

This assembly is designed to be used as a drop-in component with a variety of Ruger-brand and aftermarket 10/22-pattern fixed-barrel receivers. Simply remove the action from the stock and the trigger group from the receiver as you would for routine cleaning. Then install the Manticore X into the receiver in place of the trigger group. Lastly, attach an AR pistol grip and a rail-mounted buttstock of your choice. TandemKross offers the latter, which, along with the company’s fore-end, is shown in the photo above.

The Manticore X ships ready to use and is loaded with competition upgrades, including TK’s Ultimate Trigger Kit sporting the flat-faced Victory trigger shoe. This single-stage trigger is adjustable for a pull weight from between 2 lbs., 8 ozs., to 5 lbs. and for overtravel. The extended, textured, aluminum Fireswitch magazine-release lever is bi-directional, meaning it can be either pressed forward or pulled back to eject the magazine. Other upgrades include the oversized integral trigger guard, a Bolt Keeper bolt-hold-open lever with an extended knob, bilateral Cornerstone Rotary safety selector levers set into the front of the trigger guard and the company’s rubber Shock Block Bolt Buffer.

flat-faced trigger
Enhanced controls include a flat-faced trigger, lengthened, paddle-style magazine release and rotary safety levers (l.). A Pic rail at the rear accepts compatible buttstocks (r.).


The base of the two-slot stock-mounting rail is cut at an angle and secured with a round connector that also serves as a QD sling port. The connector can be removed to allow the rotation of the aluminum rail in order to provide either a straight-stock configuration or to give the stock a 12-degree downward cant to better fit the height of the optic being used.

To evaluate this lower’s features, it was incorporated into a complete 10/22-pattern carbine build and test fired at the shooting range. The trigger was set to 3 lbs., 8 ozs., for our range evaluation, during which it exhibited a crisp break, a short arc of travel and cycled smoothly. The other competition-grade controls were just as smooth and reliable in their operations, providing for a positive and enjoyable shooting experience.

By offering a complete set of control upgrades, an enhanced trigger and the means to install your choice of AR pistol grip and rail-mounted stocks in a convenient drop-in assembly, the Manticore X from TandemKross allows shooters to add new modularity and functionality to Ruger’s beloved 10/22 platform. The Manticore X is available in either an all-black finish or black with red appointments for a suggested retail price of $500.

For more information, visit tandemkross.com.

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