Stock PartsB5 SystemsSold by Brownells

B5 Systems

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

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 gear

Sure-grip Stock

Latch supports easy length-of-pull adjustment

$95.00
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SKU: 100016916

Overview

Built for M4-type receiver extensions, this reinforced polymer stock is aimed at shooters who want a more consistent cheekweld and straightforward length-of-pull adjustment. Its streamlined shape is designed to reduce snagging on clothing, gear, or vegetation, making it a practical choice for field use where movement and control matter. Two waterproof storage compartments provide space for small essentials, including 2 AA or 3 CR-123 batteries, while the anti-slip rubber recoil pad helps keep the weapon settled against the shoulder. A black stainless steel QD swivel mount and two molded sling slots add carry options without adding unnecessary complexity.

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 keep 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 gear or vegetation
  • Sure-Grip stock latch supports easy 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 two sling slots

Best Used For

  • Hunters wanting a more consistent cheekweld on M4-type receiver extensions
  • Users needing onboard storage for AA or CR-123 batteries
  • Field carry where snag-resistant contours help reduce interference with clothing or vegetation
  • Shooters who prefer quick, intuitive length-of-pull adjustment
  • Operators using QD sling setups and molded sling slots

Specifications

Battery Capacity2 AA or 3 CR-123 batteries
CheekweldImproved cheekweld
ColorGray
CompatibilityFits M4-type receiver extensions
Length Of Pull AdjustmentConvenient and intuitive length-of-pull adjustment
MaterialReinforced polymer
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
Stock LatchSure-Grip stock latch
Storage CompartmentsTwo waterproof storage compartments

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 keep the weapon secured to the shoulder.
  • Includes a black stainless steel QD swivel mount and molded sling slots.

Considerations & Trade-offs

  • Fits M4-type receiver extensions, so it is not a universal stock for every AR-style setup.
  • The integrated storage compartments are sized for either 2 AA or 3 CR-123 batteries, which limits what can be carried inside.
  • The streamlined profile is designed to reduce snagging, but the stock still adds built-in features that may be unnecessary for users who prefer a simpler setup.
  • Includes a black stainless steel QD swivel mount and molded sling slots, so sling attachment options are fixed to the stock’s built-in hardware.

Suggested Comparisons

  • AR-15 stock options
  • Mil-spec collapsible stocks
  • Stocks with integrated storage
  • Stocks with sling attachment points

Suggested Accessories

  • Sling swivel
  • Rifle sling
  • Battery storage
  • QD sling mount

Frequently Asked Questions

What receiver extensions is this stock designed to 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, sized to hold 2 AA or 3 CR-123 batteries.

What features help with cheek placement and shoulder contact?

The description says it offers an improved cheekweld for comfort and consistency, and it includes an anti-slip rubber recoil pad to help secure the weapon to the shoulder.

How is the length of pull adjusted?

It uses a Sure-Grip stock latch for convenient and intuitive length-of-pull adjustment.

What sling attachment options are included?

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