B5 Systems Collapsible Precision Stock Medium Black Milspec AR-15
B5 Systems
$218.50
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B5 Systems
B5 Systems Collapsible Precision Stock Medium Black Milspec AR-15
The B5 Systems Collapsible Precision Stock (CPS) Medium in Black brings competition-grade ergonomics to your Milspec AR-15 build, combining a fully adjustable cheekpiece and buttpad with the rugged reliability B5 Systems is known for.
- Precision adjustment dials control cheekweld height and buttpad position independently
- Fits standard Milspec carbine receiver extensions — no proprietary buffer tube needed
- 12 internal tensioners eliminate stock wobble for a rock-solid, rattle-free fit
- Underside M-LOK slot accepts accessories like lights, monopods, or rail panels
- Ambidextrous fixed and steel anti-rotational QD sling mounts for versatile carry options
- Fully collapsed profile clears the M4 charging handle without interference
Who This Is For
The B5 Systems CPS Medium is ideal for precision rifle competitors, serious hunters, and dedicated AR-15 enthusiasts who demand repeatable cheek weld and length-of-pull adjustability without sacrificing compatibility with their existing Milspec lower. Whether you're shooting from positional stages at a PRS match or zeroing in on long-range targets from a bench, this stock gives you the consistent, customizable fit that translates directly into tighter groups downrange.
Specifications
| Brand | B5 Systems |
|---|---|
| Model | Collapsible Precision Stock (CPS) Medium |
| Color | Black |
| Compatibility | Milspec Carbine Receiver Extension (Buffer Tube) |
| Cheekpiece | Adjustable via precision dial |
| Buttpad | Adjustable, no-slip cushioned |
| Internal Tensioners | 12 |
| Sling Mounts | Ambidextrous fixed + steel anti-rotational QD |
| Accessory Mount | Underside M-LOK slot |
| Hardware | Color-matched machined steel |
| LOP Adjustment | Pull-down with lockout |
| Country of Origin | USA |
Frequently Asked Questions
Will the B5 Systems CPS Medium fit my existing buffer tube?
Yes — the CPS Medium is designed specifically for standard Milspec carbine receiver extensions (buffer tubes), which are the most common type found on AR-15 lowers. It is not compatible with commercial-spec buffer tubes, which have a slightly larger diameter. If you're unsure which spec your lower uses, measure the outer diameter of your buffer tube or check your lower's documentation before purchasing.
What is the difference between the CPS Medium and other B5 Systems stocks like the SOPMOD or Bravo?
The CPS builds on the cheek profile of the SOPMOD and Bravo stocks but adds an independently adjustable cheekpiece and buttpad, making it the most ergonomically customizable option in the B5 lineup. The Medium length sits between compact and full-size configurations, offering a length of pull suited to most adult shooters while still clearing the M4 charging handle when fully collapsed. If you prioritize a consistent cheek weld for precision shooting over a lighter, simpler setup, the CPS is the clear step up.
Can I mount a monopod or rear bag rider to the B5 Systems CPS?
Yes — the CPS Medium features an underside M-LOK accessory slot that accepts standard M-LOK compatible accessories, including monopods, rear bag riders, and rail sections. This makes it an excellent choice for precision and long-range shooters who want rear support options without permanently modifying the stock.
