Description
The B5 Systems Collapsible Precision Stock in the Short configuration is built for folks who want the rock-solid consistency of a precision stock without giving up the versatility of a collapsible carbine setup. It builds on the proven cheek profile of B5's SOPMOD and Bravo stocks, then adds an adjustable cheekpiece and buttpad so you can get your head lined up perfectly behind whatever optic you're running. Everything rides on a standard Mil-Spec carbine receiver extension, so it drops right onto most AR-15 builds without any drama.
Why the Short CPS Fits Tighter Setups
The "Short" in the name refers to the cheekpiece length. When fully collapsed, this version is cut to clear the M110 charging handle, which makes it a smart pick for compact carbines and shorter buffer setups where a longer cheekpiece might get in the way. You still get the full range of adjustment, just packaged to play nice with tighter configurations.
Dialing In the Precision Collapsible Stock
The adjustable cheekweld and buttpad both run on precision dials, so you can fine-tune your fit and repeat it every single time. Gross length-of-pull changes happen fast with a pull-down lever that has a lockout feature, meaning once you set it, it stays put and won't creep on you under recoil. Internal tensioners take the wobble out of the equation and keep things from rattling on the buffer tube, which is one of the biggest complaints people have with lesser collapsible stocks.
Sling options are covered from every angle with ambidextrous fixed sling loops plus steel anti-rotational QD mounts, so lefties and righties both get a clean setup. Underneath there's an M-LOK section for mounting a monopod or other rear support, and there are extra slots for an accessory cheekpiece if you want to go even further. It's made of Mil-Spec materials and finishes with color-matched machined hardware, and it's proudly made in the USA. For anyone building out a designated marksman rig or a precision AR that still needs to fold down and travel, this is one of the most respected stocks on the market.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: CPS-1400
- Model: Collapsible Precision Stock
- UPC: 814927022539
- Color: Black
- Length: 9.75 in
- Cheekpiece Size: Short (clears M110 charging handle fully collapsed)
- Material: Mil-Spec Polymer
- Compatibility: Mil-Spec carbine receiver extensions (M4/A5/M110K)
- Adjustments: Cheek height and length of pull, tool-free
- Sling Mounts: Ambidextrous fixed loops and steel anti-rotational QD
- Accessory Mount: Underside M-LOK
- Country of Origin: USA
What’s Included
- B5 Systems Collapsible Precision Stock (Short), Black
Frequently Asked Questions
What buffer tube does the B5 Collapsible Precision Stock fit?
It's designed for Mil-Spec carbine receiver extensions, including M4, A5, and M110K length tubes. The internal tensioners take up any slack for a snug fit with no rattle. If you're running a commercial-diameter tube, this stock won't be the right match.
What's the difference between the Short, Medium, and Long versions?
The size refers to the length of the cheekpiece, not the stock body itself. The Short version is cut so that when fully collapsed it clears the M110 charging handle, making it a good fit for compact carbines and tighter setups. All three offer the same adjustable cheekpiece and buttpad features.
Can you adjust the cheek height and length of pull without tools?
Yes. The cheekweld and buttpad both use precision dials so you can fine-tune your fit by hand, and the gross length of pull adjusts with a pull-down lever that has a lockout to hold your setting. That means you can dial in a repeatable position and trust it to stay put through recoil.
Does this precision stock work for both left and right handed shooters?
It does. The stock includes ambidextrous fixed sling loops along with steel anti-rotational QD mounts on both sides, so you can rig a sling however you prefer regardless of your dominant hand.







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