Description
If you want the stability of a precision rifle stock but still need something that collapses out of the way, the B5 Systems Collapsible Precision Stock (CPS) hits that sweet spot. It builds on the same cheek profile B5 nailed with their SOPMOD and Bravo stocks, then adds real adjustability on top. The medium length is the one you want for a standard AR-15, since the cheekpiece sits far enough back to clear the M4 charging handle even when the stock is fully collapsed.
What the CPS-1309 Brings to Your Build
The adjustable cheekweld and buttpad ride on precision dials, so you can fine-tune the exact height that lines your eye up behind your optic. That kind of repeatable cheek weld is what separates a stock you fight against from one that just disappears when you shoulder the rifle. There are also mounting slots for an accessory cheekpiece if you run a taller scope setup and need more elevation.
Fit, Feel, and No Rattle
This stock fits mil-spec carbine receiver extensions (M4/A5/M110K), and a set of internal tensioners keeps it locked down tight to the buffer tube with no wobble or rattle. Length of pull adjusts with a pull-down lever that has a lockout feature, so it stays put once you set it. The non-slip cushioned buttpad keeps it planted on your shoulder, and it all mounts up with color-matched steel hardware.
Sling Options and Accessory Room
B5 gave the CPS plenty of attachment points. You get ambidextrous anti-rotational QD sling sockets along with fixed sling loops, so pretty much any sling setup drops right in. On the underside there's an M-LOK slot for adding a rear monopod or other stabilizing gear when you're shooting off a bag or barricade. Made in the USA from mil-spec materials and finishes, it's a stock that earns its spot on a range gun, a competition build, or a training rifle.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: CPS-1309
- UPC: 814927022256
- Model: Collapsible Precision Stock (CPS)
- Length: Medium
- Color: Wolf Grey
- Material: Mil-Spec Polymer
- Weight: 20.65 oz
- Mounting System: M-LOK (underside)
- Compatibility: Mil-Spec carbine receiver extensions (M4/A5/M110K)
- Sling Mounts: Ambidextrous anti-rotational QD sockets and fixed loops
- Adjustment: Adjustable cheekweld and buttpad via precision dials
- Internal Tensioners: Yes, 12
- Hardware: Color-matched steel
- Country of Origin: USA
What’s Included
- B5 Systems Collapsible Precision Stock (CPS-1309), Medium, Wolf Grey
Frequently Asked Questions
Will the medium Collapsible Precision Stock clear my AR-15 charging handle?
Yes, that's exactly what the medium length is built for. When fully collapsed, the cheekpiece sits far enough rearward to clear the M4 charging handle on a standard AR-15. If you're running a folding adapter or side charging handle, the long version is the better pick.
What buffer tubes does the CPS-1309 fit?
It's designed for mil-spec carbine receiver extensions, including M4, A5, and M110K tubes. It won't fit commercial-spec tubes, so double-check what's on your rifle before ordering. The internal tensioners keep it snug on the tube so there's no rattle.
Can I adjust the cheek height on this precision stock?
You can. The cheekweld and buttpad both ride on precision dials for height adjustment, which lets you line your eye up behind your optic and get a consistent cheek weld every time. There are also slots to add an accessory cheekpiece if you need extra elevation for a taller scope mount.
Does the Collapsible Precision Stock have sling attachment points?
It's loaded with them. You get ambidextrous anti-rotational QD sling sockets plus fixed sling loops, so most sling setups will work right out of the box. There's also an M-LOK slot on the underside for mounting a rear monopod or other stabilizing accessory.




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