Product Description
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Introducing the Haga Defense Gen 4 lineup—a cutting-edge evolution of upgrades for the FN PS90 and P90, meticulously refined since 2014 to deliver unparalleled performance and innovation.
Elevate your FN PS90 with Haga Defense’s premium stock extensions, engineered for a custom fit and enhanced shooting experience. Precision-crafted from lightweight, high-strength nylon, these extensions are available in 1", 2", 3", and 4" lengths, empowering you to tailor your firearm for optimal comfort and control.
Designed for shooters who find the standard PS90's length of pull (LOP) too short, our extensions improve ergonomics, offering superior handling for confident, precise shots. The factory buttpad is seamlessly reused and reinstalled on the back of the extension, ensuring the same familiar comfort and non-slip performance you already trust.
In a restricted state? The 3" extension is ideal for Maryland shooters, while the 4" extension suits California, meeting state-specific length requirements without compromising quality. Built for durability and flawless integration, these extensions preserve the PS90’s sleek aesthetic while unlocking its full potential.
Choose your ideal length and experience the Haga Defense difference—where innovation meets shooter-driven design.
Key Features:
- Available in 1", 2", 3", and 4" lengths for personalized customization
- Constructed from robust, lightweight nylon for enduring performance
- Reuses factory buttpad for consistent comfort and non-slip reliability
- 3" extension optimized for Maryland OAL laws
- 4" extension optimized for California OAL laws
- Enhances ergonomics for improved handling and precision
- Easy to install using the same tool-less method as the factory buttpad, integrating seamlessly with the FN PS90
- Made in the USA
Installation:
- Set the fire selector at the position ‘S’ (safe).
- Pull the magazine catch rearward in order to release the magazine and then remove the magazine.
- Pull the cocking handle completely rearward and hold it in that position. Through the magazine opening, look into the chamber of the carbine in order to ensure that there is no cartridge in the chamber.
- If the chamber is empty, release the cocking handle.
- If not already done, pull the cocking handle completely rearward and then release it. This operation is necessary because it is only possible to remove the moving parts group and the hammer group when the hammer is at the (lowered) cocked position. From now on, do not pull the trigger : the hammer would again be positioned at its (raised) decocked position.
- While pushing down on the barrel support lock, release the barrel support and upper rail group by moving it slightly forward and then slide it completely out of the frame.
- Release the moving parts group by pushing it forward (via the magazine opening) and then carefully slide it completely out of the frame.
- At the rear, slide the butt plate up and off the frame.
- Slide the butt plate onto the new extension the same way it fits the factory stock.
- The extension includes a pre-installed 1/4"-20 internal set screw used to lock the butt plate in place. Use the included 1/8" hex wrench to tighten the set screw until the butt plate can no longer slide upward. Be careful not to over-tighten the set screw as this can damage the extension.
- With the butt plate secure, slide the extension onto the rifle the same way you would the factory butt plate.
- Slide the moving parts group back into position. This will lock the extension in place.
- Re-install the barrel support and upper rail group into the frame. Press the barrel support lock to start sliding the assembly into the frame and continue until it locks into place.
- After having reassembled the firearm with an empty magazine, point it in a safe direction and then pull the trigger in order to decock the hammer. Before carrying out this step, ensure that the magazine and, of course, the chamber are really empty!
