B5 Systems

B5 Systems Collapsible Precision Stock Medium for AR-15

Name: B5 Systems Collapsible Precision Stock Medium for AR-15
Brand: B5 Systems
SKU: CPS-1304

£269.99

VAT included.

£5 Tracked Delivery · 7–10 Business Days

Estimated delivery: Tue 8 Sep – Fri 11 Sep

Stock is imported from the USA to us, then shipped to you from the UK — we cover all duties and import charges, so there is nothing to pay on delivery.

Colour: Black

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Product Overview

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 full-envelope precision stock — the CPS Medium pairs adjustable fit with the reach taller shooters need.

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.

Why shooters choose the CPS Medium

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 colours — Black, Flat Dark Earth, Coyote Brown, Olive Drab Green

What the CPS Medium fits

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.

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
MPN	CPS-1304 · CPS-1305 · CPS-1306 · CPS-1308

Fit, dialled. Order the CPS Medium today — in stock at Xtreme Tactical Gun Parts with £5 tracked UK delivery in 7–10 business days.

Explore more: Rifle & Shotgun Stocks, Precision Rifle Stocks, AR-15 Parts or browse all B5 Systems.

Compatibility & Fitment

Fits AR-15/M4 rifles with a Mil-Spec-diameter carbine receiver extension (buffer tube). Check your tube specification before ordering.

Please confirm platform, interface and fitment requirements before ordering.

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
MPN	CPS-1304 · CPS-1305 · CPS-1306 · CPS-1308
SKU / MPN	CPS-1304
UPC / Barcode	814927022201

Shop Related Categories

Shop AR-15 Parts & Accessories View category

Shop B5 Systems View category

Shop B5 Systems Stocks View category

Shop Precision Rifle Stocks View category

Related Buying Guides

Not sure which option is right for your build? These guides break it down.

Buying Guide How to Choose an AR-15 Stock: Fit, Length of Pull & Platform

Buying Guide Best AR-15 Upgrades Under £100 (That Actually Make a Difference)

Buying Guide B5 Systems: The SOPMOD Story — Bravo, CPS & P-Grip Explained

View all buying guides →

Product 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 kit 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. It is a B5 design through and through, and the B5 Systems brand guide covers how the range fits together.

What colours can I get and what else should I budget for?

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.

What are the delivery and returns arrangements?

Orders leave the United Kingdom with £5 tracked UK delivery in 7–10 business days, and you'll get tracking by email when it ships. If a part turns out to be the wrong fit, see our returns policy or contact us and we'll help sort it.