The MBS 22 seamlessly transforms Ruger® 10/22® and Takedown® rifles into a compact, modern bullpup platform without the drawbacks of other conversions. This latest evolution in chassis design was engineered to feel like an extension of the 10/22, rather than another bolt-on accessory. Featuring an adjustable trigger system, rapid teardown procedure, ambidextrous charging handle, and extendable stock, the MBS 22 delivers the fit, finish, and function of a premium, purpose-built bullpup to America’s favorite rimfire rifle.
Feature overview:
Trigger linkage is adjustable for take-up, overtravel, and spring tension
Includes two interchangeable trigger linkage modules:
Field strips in seconds with just three captive pins and the factory takedown screw
Fully ambidextrous with forward charging handle, removable shell deflector, and trigger block safety
Bolt hold open feature integrated into charging handle
Compact design with exceptional balance– 10” shorter than standard 10/22’s
Integrated Picatinny rails with included handstop and 10 M-LOK® slots
Storage compartments in both the grip and stock that can hold one spare 10-round factory (BX-1) magazine, tools, or other accessories
Removable knuckle guard
Broad barrel compatibility, accepting 18” barrels, bull barrels up to .920", and barrels as short as 9" (SBR) with shrouds and suppressors as wide as 1.375”
Impact resistant glass-reinforced polymer and nitride-treated steel components
Compatible with Ruger® 10/22® and 10/22 Takedown® rifles**
Made in the USA and backed by High Tower Armory's lifetime warranty
Unlike traditional clamshell-style stocks that rely on numerous pieces of hardware, our Modular Bullpup System is designed for serviceability with an upper/lower design. In mere seconds, the MBS 22 can be field stripped by simply pushing out 3 pins and removing the standard action screw. At the heart of the MBS 22 is our adjustable steel trigger linkage. Users can choose between a smooth Direct Pull Linkage, which translates rearward like conventional linkages, or the innovative Cammed Trigger Linkage, which uses leverage to reduce the perceived trigger weight of the factory Ruger trigger by about 30%, while requiring no permanent modifications to the rifle. Another feature unique to the MBS 22 lineup is the integrated ambidextrous charging handle. Beyond improving loading and clearing ergonomics, the charging handle doubles as an intuitive bolt hold-open mechanism. Rotate it upward to lock the action open, then release it with a simple downward slap.
With a better balanced center of gravity, ambidextrous trigger block safety, and removable shell deflector for left handed shooters, the MBS 22 delivers exceptional handling for shooters of all shapes and sizes, and for nearly any application. Made in the USA using durable glass-reinforced injection-molded polymer and nitride-treated steel components to withstand decades of hard use. Like every High Tower Armory product, the MBS 22 is backed by our lifetime warranty.
Specifications
Chassis length: 22.8”
Overall rifle length (required minimum 18" barrel ***): 26.1"
Assembled rifle weight: Approximately 5.25 lbs
Chassis weight: 2.25 lbs
Barrel compatibility: includes 3 barrel bushing for common sizes and .920" bull barrels
SBR compatibility: barrels as short as 9"
Suppressor compatibility: handguard accepts suppressors up to 1.375” in diameter
Safety: Ambidextrous trigger block with access to OEM safety
Materials: Glass-reinforced polymer and nitride-treated steel
*Ruger 10/22, optics, suppressor, magazines, and other accessories shown are not included.
**Not compatible with some aftermarket actions and trigger assemblies. OEM Ruger action and Weaver rail recommended for best fit. Contact HTA for compatibility questions before purchase.
*** US RESIDENTS: IMPORTANT! 10/22 barrels 18.0" and over are long enough to produce a legal length rifle in the MBS 22 in most jurisdictions. Federal laws and regulations have established that rifles must have a minimum barrel length of 16" and an overall length of 26". Some states or local jurisdictions may have further regulations governing this product when assembled on a 10/22 (CT, D.C., DE, IL, MA, MD, NJ, NY, WA, etc.) This stock will add what is considered a "pistol grip" by some states, as well as shorten the overall length below some states' minimum requirement which may be longer than 26" (WA). By purchasing this item, the buyer is acknowledging they understand their state and local laws and intend to comply with these infringements. Please review our compliance guide to determine if this product is legal to install in your jurisdiction.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and reproductive harm. For more information, go to https://www.P65Warnings.ca.gov