B5 Systems Ar-15 Enhanced Sopmod Stock Collapsible Mil-Spec Gray

The B5 Systems AR-15 Enhanced Sopmod Stock is a collapsible mil-spec stock built to military standards for reliability when it matters most. If you're running an M4-type receiver extension and want a stock that combines comfort, function, and durability without unnecessary complexity, this is a serious option. The Sopmod design has proven itself in the field, and B5 Systems' civilian version maintains that rugged engineering while adding thoughtful features for hunters, sport shooters, and tactical enthusiasts.

A properly fitted stock makes the difference between a rifle that feels right and one that doesn't. The Enhanced Sopmod includes an improved cheekweld geometry that promotes consistent shooting position and comfort during longer shooting sessions. The Sure-Grip stock latch lets you adjust length-of-pull smoothly and lock it down tight—no guessing, no slop. The anti-slip rubber recoil pad keeps the stock planted firmly against your shoulder, which matters whether you're shooting magnum loads or running drills on the clock.

Build quality is visible in the details. Streamlined contours resist snagging on slings, gear, or brush, which keeps your rifle ready and your operation quiet. The stock includes waterproof storage compartments running the length of the body—room for 2 AA or 3 CR-123 batteries, depending on your lighting or optic needs. You also get a stainless steel QD swivel mount and two molded 1¼" wide sling slots, so you can rig it the way you shoot. The mil-spec gray finish is durable and subdued.

This is a stock that does its job without fuss: adjust, lock, shoot, move on. Whether you're building an AR for duty, hunting, or the range, the B5 Sopmod delivers the kind of no-drama performance that keeps you focused on hitting your target.

Key Features

• Improved cheekweld for consistent shooting position and comfort
• Sure-Grip latch for smooth, positive length-of-pull adjustment
• Anti-slip rubber recoil pad keeps the stock seated on the shoulder
• Waterproof storage compartments hold 2 AA or 3 CR-123 batteries
• Streamlined contours resist snagging on equipment and vegetation
• Stainless steel QD swivel mount included
• Two molded 1¼" wide sling slots for attachment options
• Mil-spec gray finish; fits M4-type receiver extensions

Specifications

Frequently Asked Questions

Will this stock fit my AR-15?

The B5 Systems Enhanced Sopmod Stock is designed for M4-type receiver extensions (mil-spec). If your AR-15 uses a standard mil-spec buffer tube, it will fit. Check your receiver extension diameter and thread pitch to confirm compatibility before purchase.

What can I store in the waterproof compartments?

The compartments running the length of the stock are waterproof and sized to hold 2 AA batteries or 3 CR-123 batteries. Many shooters use them for spare batteries for lights or optics, but you can store other small items like lubricant packets or cleaning patches.

Does the stock come with a sling?

The stock itself does not include a sling, but it comes with two molded 1¼" wide sling slots and a stainless steel QD swivel mount, so you can attach any compatible sling or attachment system you prefer.

Is this stock as tough as military-issue versions?

The B5 Systems Enhanced Sopmod Stock is built to military standards and uses the same rugged polymer construction and design principles as issue stocks. It's designed for durability in hard use, though exact military specification compliance may vary by revision and context.