My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Wish list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Rifle Parts Stock Parts Buttstocks BROWNELLS AR-15 ACS STOCK ASSEMBLY COLLAPSIBLE MIL-SPEC GRAY Support

The AR-15 ACS Stock offers enhanced storage, a comfortable cheekweld, and a dual-locking system, perfect for tactical operators seeking reliability and functionality.

BROWNELLS AR-15 ACS STOCK ASSEMBLY COLLAPSIBLE MIL-SPEC GRAY

084000400

Filters:

Variations
Filters:
Variations:

Variations:

The AR-15 ACS Stock offers enhanced storage, a comfortable cheekweld, and a dual-locking system, perfect for tactical operators seeking reliability and functionality.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSEMBLY COLLAPSIBLE MIL-SPEC GRAY
174.9 GBP 0 £174.90 *
Backorderable
Color: Gray Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 084000400
Backorderable
174.9 GBP 0 £174.90 *
The Brownells AR-15 ACS Stock offers enhanced storage, a secure cheekweld, dual-locking lever, and streamlined design for tactical efficiency and comfort.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC ODG
174.9 GBP 13 £174.90 *
In stock
Color: O.D. Green Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 078000222
In stock
174.9 GBP 13 £174.90 *
The AR-15 ACS Stock offers enhanced storage, a secure cheekweld, dual-locking lever, and streamlined design for optimal performance and comfort in tactical situations.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC BLACK
174.9 GBP 0 £174.90 *
Backorderable
Color: Black Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 078000220
Backorderable
174.9 GBP 0 £174.90 *
The BROWNELLS AR-15 ACS Stock offers enhanced storage, a secure cheekweld, dual-locking lever, and streamlined design for tactical efficiency and comfort.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC FDE
164.9 GBP 0 £164.90 *
Backorderable
Color: Flat Dark Earth Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 078000221
Backorderable
164.9 GBP 0 £164.90 *
164.9 174.9 4 GBP
174.9 GBP £174.90

Prices inclusive of duty & VAT.

Product no.: 084000400

Adaptable Carbine/Storage (ACS) stock is a drop-in replacement for standard USGI M4 collapsible stock that gives the tactical operator extra storage options, a secure, comfortable cheekweld, and an advanced dual-locking lever. Smooth, streamlined exterior contours prevent snagging on clothing, sling, or vegetation, and help ensure fast exits from vehicles without snagging on gear. Removable battery storage compartments run the full length of the extra-wide comb and hold 2 AA or 3 CR-123 batteries, while providing a wide, contoured area for an exceptionally solid, comfortable cheekweld. Secure molded rubber caps keep water and dust out of compartments and face the rear of the stock for easy removal; cap exterior is beveled to resist snagging when shouldering weapon. Positive-locking trapdoor on right side of the stock reveals a roomy storage compartment for additional batteries, coiled up cleaning cable and other cleaning supplies, ear plugs, spare parts, or other small items. Magpul’s dual locking system uses an additional cam lever to protect the release lever from accidental operation, yet still allows you to adjust length of pull by simply pushing on the release lever. Slot molded in the toe provides an attachment point for a 1¼" wide sling. Also includes the same detachable rubber buttpad found on Magpul CTR and UBR buttstocks to help keep stock firmly mounted on shoulder. The ASC Buttstock Kit includes the following items: Mil-Spec buffer tube Carbine buffer Chrome Silicone recoil spring Receiver end plate Receiver extension castle nut
Backorderable
Be the first to rate this product
1
2
3
4
5
6
7
8
9
10+
£174.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

100-Day Return Policy

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

100-Day Return Policy
No charges until we ship
No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.
  • Extra storage options
  • Secure, comfortable cheekweld
  • Advanced dual-locking lever
Wish List Ask question
164.9 174.9 4 GBP
Description Specification Customers reviews Accessories

BROWNELLS AR-15 ACS STOCK ASSEMBLY COLLAPSIBLE MIL-SPEC GRAY

174.9 GBP £174.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+
£174.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.

100-Day Return Policy

Description:

Upgrade your tactical setup with the AR-15 ACS Stock Assembly.

The Adaptable Carbine/Storage (ACS) stock is an exceptional drop-in replacement for the standard USGI M4 collapsible stock. It provides tactical operators with enhanced storage options, a secure and comfortable cheekweld, and an advanced dual-locking lever.

Key Features:

  • Smooth, streamlined exterior contours to prevent snagging on clothing, slings, or vegetation.
  • Facilitates quick exits from vehicles without snagging on gear.
  • Removable battery storage compartments along the full length of the extra-wide comb, accommodating 2 AA or 3 CR-123 batteries.
  • Wide, contoured area for an exceptionally solid and comfortable cheekweld.
  • Secure molded rubber caps to keep water and dust out of compartments, designed for easy removal.
  • Positive-locking trapdoor on the right side reveals a spacious storage compartment for additional batteries, cleaning supplies, ear plugs, spare parts, or other small items.
  • Magpul’s dual locking system features an additional cam lever to protect the release lever from accidental operation.
  • Length of pull can be adjusted simply by pushing on the release lever.
  • Slot molded in the toe provides an attachment point for a 1¼" wide sling.
  • Includes a detachable rubber buttpad similar to that found on Magpul CTR and UBR buttstocks for a secure fit on your shoulder.

Included in the ASC Buttstock Kit:

  • Mil-Spec buffer tube
  • Carbine buffer
  • Chrome Silicone recoil spring
  • Receiver end plate
  • Receiver extension castle nut

Specifications:

  • Material: Reinforced molded polymer
  • Colour Options: Black, Dark Earth, or O.D. Green
  • Overall Length: 77/8" (20cm)
  • Height: 5¼" (13.3cm)
  • Weight: 13.6 oz. (385g)

Enhance your AR-15 with the ACS Stock Assembly from BROWNELLS and experience the difference in performance and comfort.



Attributes

  • Colour: 
    Gray
  • Material: 
    Polymer
  • Style: 
    Collapsible
  • Type: 
    Mil-Spec
  • Weapon type: 
    AR-15
  • Delivery weight: 0.862kg

Item details

Made in USA
US export classification: 0A501.x

Customers reviews

Customer ratings (0)

0 / 5

Variations:

The AR-15 ACS Stock offers enhanced storage, a comfortable cheekweld, and a dual-locking system, perfect for tactical operators seeking reliability and functionality.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSEMBLY COLLAPSIBLE MIL-SPEC GRAY
174.9 GBP 0 £174.90 *
Backorderable
Color: Gray Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 084000400
Backorderable
174.9 GBP 0 £174.90 *
The Brownells AR-15 ACS Stock offers enhanced storage, a secure cheekweld, dual-locking lever, and streamlined design for tactical efficiency and comfort.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC ODG
174.9 GBP 13 £174.90 *
In stock
Color: O.D. Green Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 078000222
In stock
174.9 GBP 13 £174.90 *
The AR-15 ACS Stock offers enhanced storage, a secure cheekweld, dual-locking lever, and streamlined design for optimal performance and comfort in tactical situations.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC BLACK
174.9 GBP 0 £174.90 *
Backorderable
Color: Black Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 078000220
Backorderable
174.9 GBP 0 £174.90 *
The BROWNELLS AR-15 ACS Stock offers enhanced storage, a secure cheekweld, dual-locking lever, and streamlined design for tactical efficiency and comfort.
AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC - AR-15 ACS STOCK ASSY COLLAPSIBLE MIL-SPEC FDE
164.9 GBP 0 £164.90 *
Backorderable
Color: Flat Dark Earth Make: AR-15 Material: Polymer Style: Collapsible Type: Mil-Spec Product no.: 078000221
Backorderable
164.9 GBP 0 £164.90 *

Customers also bought

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top