B5 Systems Collapsible Precision Stock Medium Milspec Carbine
B5 Systems
$218.50
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B5 Systems
B5 Systems Collapsible Precision Stock Medium Milspec Carbine
The B5 Systems Collapsible Precision Stock (CPS) Medium brings mil-spec carbine compatibility together with precision-rifle-grade adjustability, delivering a purpose-built stock for shooters who demand repeatable cheekweld and length-of-pull in every session.
- Adjustable cheekpiece and buttpad with precision dials for consistent weld
- Fits standard mil-spec carbine receiver extensions — no proprietary tube needed
- 12 internal tensioners eliminate wobble and rattle on the buffer tube
- Gross length-of-pull adjustment via pull-down lever with positive lockout
- Underside M-LOK slot and ambidextrous QD/fixed sling mounts included
- Proudly made in the USA with color-matched machined hardware throughout
Who This Is For
The B5 Systems CPS Medium is ideal for AR-15 owners who want precision-stock performance without leaving the mil-spec platform — competitive shooters, serious hunters, and home-defense builds alike will appreciate the repeatable fit, rock-solid lockup, and versatile sling attachment options. The medium profile is well-suited to shooters running standard M4-pattern charging handles, as the stock fully clears the handle when collapsed.
Specifications
| Brand | B5 Systems |
|---|---|
| Model | Collapsible Precision Stock (CPS) Medium |
| Tube Compatibility | Mil-Spec Carbine Receiver Extension |
| Cheekpiece | Adjustable via precision dial |
| Buttpad | Adjustable, no-slip cushioned |
| LOP Adjustment | Pull-down lever with lockout |
| Internal Tensioners | 12 |
| Sling Mounts | Ambidextrous fixed + steel QD (quick-disconnect) |
| Accessory Rail | M-LOK slot (underside) |
| Hardware | Color-matched machined steel/aluminum |
| Country of Origin | USA |
Frequently Asked Questions
Will the B5 Systems CPS Medium fit my existing mil-spec buffer tube?
Yes. The CPS Medium is designed specifically for standard mil-spec diameter carbine receiver extensions (buffer tubes). It will not fit commercial-spec tubes, which have a slightly larger and tapered diameter. If you are unsure which tube you have, mil-spec tubes are typically anodized and measure approximately 1.14 inches in outer diameter.
What is the difference between the CPS Medium and other CPS sizes?
B5 Systems offers the CPS in multiple cheekpiece height profiles to accommodate different optic heights. The Medium profile is optimized for mid-height optics and standard M4-style charging handles — the stock fully clears the charging handle when collapsed, making it a versatile choice for most AR-15 builds. Shooters running very tall optics or suppressor-height sights may want to evaluate the taller CPS variant.
How do I adjust the cheekweld and length of pull on the CPS?
Length of pull is adjusted by pulling down on the release lever and sliding the stock to your preferred position along the buffer tube, then releasing to lock. The cheekpiece height and buttpad are each adjusted independently using the precision dials on the stock body — simply turn the dial to raise or lower each component. Once set, both adjustments hold their position firmly under recoil, ensuring a consistent fit shot after shot.
