The B5 Systems Collapsible Precision Stock (Medium) is an adjustable precision rifle stock for AR-15 and M4 rifles, fitting any Mil-Spec-diameter carbine receiver extension.
The B5 Systems Collapsible Precision Stock in Medium configuration delivers the CPS system — a precision-adjustable cheek riser and adjustable buttpad on a collapsible Mil-Spec chassis — with a longer extension envelope suited to taller shooters and longer length-of-pull preferences. Eye alignment behind magnified glass becomes a setting you dial in, not a compromise you tolerate.
B5 Systems over-builds its adjustment hardware: the riser and pad lock positively and hold their zeroed positions through recoil, transport and hard positional work. The Medium CPS is the pick for full-size precision gas guns that still need to collapse for the case.
Key Features
- Precision-adjustable cheek riser — repeatable eye-to-optic geometry
- Adjustable buttpad — dial the shoulder interface precisely
- Medium envelope — the right reach for taller shooters
- Over-built hardware — settings that survive hard use
- Four colors — Black, Flat Dark Earth, Coyote Brown, Olive Drab Green
Compatibility & Fitment
Fits AR-15/M4 rifles running a Mil-Spec-diameter carbine receiver extension (buffer tube). It replaces a standard collapsible stock on the existing tube, so no change of buffer or spring is normally involved. Commercial-diameter tubes are not compatible, so confirm your tube specification first. Set cheek height and pad position at the bench behind your optic; the locks hold your numbers.
Technical Specifications
Platform | AR-15 / M4 |
Fits | Mil-Spec carbine receiver extension |
Type | Collapsible precision stock |
Finish | Black, Flat Dark Earth, Coyote Brown, Olive Drab Green |
Length | Medium |
Adjustment | Precision cheek riser & buttpad |
Brand | B5 Systems |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Which rifles will the medium CPS go on?
Any AR-15/M4 with a Mil-Spec-diameter carbine receiver extension. It replaces a standard collapsible stock on the existing tube, so no change of buffer or spring is normally involved. Commercial-diameter tubes are not compatible, so confirm your tube specification first.
Should I pick medium over short?
The medium body gives a slightly longer reach through its range of positions, which tends to suit shooters using a settled, squared-up position behind a scope or those with longer arms. The short-length CPS is the one to choose if compact overall length or shooting in gear and body armor matters more. If you are between the two, measure your current comfortable length of pull and work from there.
What makes it a precision stock if it still collapses?
It combines a collapsible carbine body with an adjustable cheek riser and buttpad, so you get repeatable head and shoulder placement without giving up the ability to shorten the rifle for storage or transport. That is the main reason people choose it over a fixed precision stock.
What colors can I get and what else do I need?
The medium CPS is available in Black, Flat Dark Earth, Coyote Brown and Olive Drab Green. Beyond the stock itself you only need your existing buffer tube assembly, though a sling mount is worth thinking about if your current one lives on the old stock. Check what sling attachment you are using before you swap.
