Description
The B5 Systems Accessory Cheekpiece (ACP) is a simple add-on that solves a real problem: getting your eye lined up cleanly behind a tall optic. When you bump up to a magnified scope on a higher mount, the factory cheek riser on a precision stock sometimes just can't get you high enough for a solid weld. This piece is built to fix that.
It fits all variants of the B5 Collapsible Precision Stock, including the Short, Medium, and Long. Installation is about as easy as it gets. The cheekpiece mounts and slides into the undercuts already machined into the CPS, so there's no drilling, no adapters, and no fuss. Once it's on, you get an extra 3/8" of height plus horizontal adjustment, which lets you nudge your cheek placement left or right until your eye naturally falls in line with the reticle. That kind of repeatable position is what helps you stay consistent from shot to shot.
B5 built this out of the same Mil-Spec materials and finish as the rest of their gear, so it holds up to hard use and weather without complaint. The soft overmold surface is the part you'll appreciate most after a long range session, since it gives your cheek something forgiving to rest against instead of bare polymer. It's a light part too, right around two ounces, so it won't throw off the balance of your build.
The Coyote Brown color is made to match B5's standard lineup, so it blends cleanly with a coyote stock, grip, and rail setup. This one is aimed at anyone running a CPS stock who wants a taller, more comfortable cheek weld for precision rifle work, PRS-style matches, or just dialing in a scoped AR the way it should feel. Keep in mind it's an accessory designed specifically for the CPS platform, so you'll need that stock already on your rifle to use it.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: CPS-1439
- UPC: 814927022935
- Color: Coyote Brown
- Added Height: 3/8 inch
- Adjustment: Height and horizontal
- Compatibility: All B5 Collapsible Precision Stock (CPS) variants
- Material: Mil-Spec materials and finish
- Surface: Soft overmold
- Weight: Approx. 2 oz
- Length: 4.50 in
- Width: 2.43 in
- Country of Origin: USA
Frequently Asked Questions
What stocks does this cheek piece fit?
It's designed to fit all variants of the B5 Collapsible Precision Stock, including the Short, Medium, and Long. It mounts into the undercuts that are already machined into the CPS. It is not a universal cheek riser, so it will only work on the CPS platform.
How much height does it add?
The ACP adds 3/8" of additional height on top of what the CPS stock's built-in cheek riser already offers. It also allows for horizontal adjustment, so you can shift your cheek placement side to side. That extra elevation is a big help when running taller optics or higher scope mounts.
Do I need any tools to install it?
No tools or drilling are required. The cheekpiece slides onto the mounting slots and undercuts found on the CPS stock and adjusts by hand. It's a quick install that takes just a minute or two.
Is the surface comfortable for long shooting sessions?
Yes, it features a soft overmold instead of hard bare polymer, which gives your cheek a more forgiving surface to rest against. That makes a noticeable difference during extended range days or precision matches. It's a small touch that pays off when you're behind the rifle for hours.
Will the Coyote Brown match my other gear?
The Coyote Brown finish is part of B5's standard color lineup, so it's made to match their coyote stocks, grips, and other accessories. If you're running a coyote-themed build, it should blend in cleanly. B5 also offers this cheekpiece in Black, FDE, and Wolf Grey if you need a different shade.





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