B5 Systems Collapsible Precision Stock Long Milspec AR-15
B5 Systems
$218.50
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B5 Systems
B5 Systems Collapsible Precision Stock Long Milspec AR-15
The B5 Systems Collapsible Precision Stock (CPS) Long delivers competition-grade adjustability and rugged mil-spec reliability in a single carbine stock, purpose-built for AR-15 platforms running side-charging uppers or LAW Tactical folding adapters.
- Precision-dial adjustable cheekweld and buttpad for repeatable fit
- Fits standard mil-spec carbine receiver extensions — no proprietary tube needed
- 12 internal tensioners eliminate wobble for a rock-solid lockup
- Underside M-LOK slot accepts accessory cheekpieces and rail sections
- Ambidextrous fixed sling mounts plus steel anti-rotational QD sockets
- Gross length-of-pull adjustment via pull-down lever with positive lockout
Who This Is For
The CPS Long is ideal for precision AR-15 shooters, competitive marksmen, and tactical rifle builders who demand a consistent cheekweld and customizable length of pull without sacrificing the compact collapsibility of a carbine stock. It is especially well-suited for rifles equipped with a LAW Tactical side-folding adapter or a side-charging upper receiver, where the extended geometry of the Long variant clears the action cleanly and provides a natural shooting position.
Specifications
| Brand | B5 Systems |
|---|---|
| Model | Collapsible Precision Stock (CPS) Long |
| Compatible Extension | Mil-Spec Carbine Receiver Extension |
| Cheekpiece | Adjustable via precision dial |
| Buttpad | Adjustable via precision dial |
| Length of Pull Adjustment | Pull-down lever with lockout |
| Internal Tensioners | 12 |
| Accessory Mount | M-LOK (underside) |
| Sling Mounts | Fixed (ambidextrous) + Steel QD anti-rotational |
| Hardware | Color-matched machined steel |
| Optimized For | Side-charging uppers, LAW folding adapters |
| Country of Origin | USA |
Frequently Asked Questions
What makes the CPS Long different from the standard CPS?
The CPS Long features an extended overall length profile compared to the standard Collapsible Precision Stock. This additional length is specifically optimized for use with side-charging upper receivers and LAW Tactical side-folding stock adapters, providing proper clearance for the charging handle and a more natural cheek-to-stock weld in those configurations. If you run a traditional rear-charging AR-15 with no folding adapter, the standard-length CPS may suit you equally well.
Will the B5 Systems CPS Long fit my existing mil-spec buffer tube?
Yes. The CPS Long is designed to fit standard mil-spec carbine receiver extensions (buffer tubes), which are the most common diameter found on AR-15 rifles. It is not compatible with commercial-spec (slightly larger diameter) buffer tubes. If you are unsure which tube your rifle uses, measure the outer diameter — mil-spec tubes measure approximately 1.148 inches in diameter at the collar.
How do I adjust the cheekpiece and buttpad height?
Both the cheekpiece and buttpad are adjusted independently using precision-machined dials located on the stock body. Simply rotate each dial to raise or lower the respective component to your preferred position. Once set, the dials hold their position securely under recoil, allowing you to return to your exact zero-distance settings shot after shot — a key advantage for precision and competition shooting applications.
