Stock PartsB5 SystemsSold by Brownells

B5 Systems

Ar-15 Enhanced Sopmod Stock Collapsible Mil-Spec - Ar-15 Enhanced Sopmod Stock Collapsible Mil-Spec Blk

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Reinforced Polymer

Stock fits M4-type receiver extensions

Improved Cheekweld

For added comfort and consistency

Two Waterproof

Storage compartments hold 2 AA

Streamlined Contours

Help resist snagging on clothing,

Sure-grip Stock

Latch allows convenient length-of-pull adjustment

$95.00
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SKU: 100009033

Overview

Built for M4-type receiver extensions, this stock is intended for shooters who want a more consistent cheek position and a straightforward way to adjust length of pull. Its reinforced polymer construction includes two waterproof storage compartments sized for 2 AA or 3 CR-123 batteries, adding practical carry space without changing the rifle’s profile. Streamlined contours are designed to reduce snag points on clothing, gear, or vegetation, making it a sensible option for field use where clean handling matters. A Sure-Grip latch, anti-slip rubber recoil pad, black stainless steel QD swivel mount, and two molded sling slots round out the setup for controlled, adaptable carry.

Why Hunters Choose the B5 Systems

Improved Cheekweld

Supports more consistent shoulder placement

Two Waterproof

Storage compartments hold 2 AA

Streamlined Contours

Help reduce snagging on clothing,

Sure-grip Stock

Latch allows convenient length-of-pull adjustment

Anti-slip Rubber

Recoil pad helps secure the

Key Features

  • Reinforced polymer stock fits M4-type receiver extensions
  • Improved cheekweld for added comfort and consistency
  • Two waterproof storage compartments hold 2 AA or 3 CR-123 batteries
  • Streamlined contours help resist snagging on clothing, equipment, or vegetation
  • Sure-Grip stock latch allows convenient length-of-pull adjustment
  • Anti-slip rubber recoil pad helps secure the weapon to the shoulder
  • Black stainless steel QD swivel mount and two molded sling slots

Best Used For

  • Hunters wanting a more consistent cheek weld on an M4-type receiver extension
  • Users needing waterproof storage for AA or CR-123 batteries in the stock
  • Field operators who prefer streamlined contours that reduce snagging on gear or vegetation
  • Shooters seeking quick, intuitive length-of-pull adjustment with a Sure-Grip latch
  • Anyone using a black stock with QD swivel mount and molded sling slots

Specifications

Battery Capacity2 AA or 3 CR-123 batteries
CheekweldImproved cheekweld
CollapsibleYes
ColorBlack
FitsM4-type receiver extensions
Length Of Pull AdjustmentSure-Grip stock latch
MaterialReinforced polymer
Mil SpecYes
Qd Swivel MountBlack, stainless steel QD swivel mount
Recoil PadAnti-slip rubber recoil pad
Sling SlotsTwo molded 1A 1/4" wide sling slots
Snag ResistanceStreamlined contours resist snagging on clothing, equipment, or vegetation
Storage CompartmentsTwo waterproof storage compartments
Waterproof StorageYes

Pros

  • Improved cheekweld supports more consistent shoulder placement and comfort.
  • Two waterproof storage compartments hold 2 AA or 3 CR-123 batteries.
  • Streamlined contours help reduce snagging on clothing, gear, or vegetation.
  • Sure-Grip stock latch allows convenient length-of-pull adjustment.
  • Anti-slip rubber recoil pad helps secure the weapon to the shoulder.
  • Includes a black stainless steel QD swivel mount and molded sling slots.

Considerations & Trade-offs

  • Designed for M4-type receiver extensions, so compatibility depends on the rifle’s buffer tube setup rather than being universal.
  • The integrated storage compartments are sized for 2 AA or 3 CR-123 batteries, which is useful but limits what can be carried inside the stock.
  • Its streamlined profile is intended to reduce snagging, but the added features and storage make it a more specialized stock than a basic collapsible option.
  • The anti-slip pad and cheekweld features support comfort and consistency, but fit and feel remain personal and should be matched to the shooter’s setup.

Suggested Comparisons

  • Mil-spec collapsible AR-15 stock
  • AR-15 buffer tube accessory
  • Sling mount and stock upgrade
  • Reinforced polymer rifle stock

Suggested Accessories

  • QD sling swivel
  • Rifle sling
  • Battery storage organizer
  • Rail-mounted accessory light

Frequently Asked Questions

What receiver extensions does this stock fit?

It fits M4-type receiver extensions.

Does the stock provide storage?

Yes. It has two waterproof storage compartments running the length of the stock.

What can the storage compartments hold?

They are described as holding 2 AA or 3 CR-123 batteries.

Does it include sling attachment options?

Yes. The stock features a black stainless steel QD swivel mount and two molded 1A 1/4" wide sling slots.

What comfort or handling features are mentioned?

The description says it offers an improved cheekweld for increased comfort and consistency, along with a Sure-Grip stock latch for length-of-pull adjustment and an anti-slip rubber recoil pad.