Description
The Enhanced SOPMOD is B5 Systems' take on a design that earned its stripes with special operations units. It traces back to the NSWC Crane developed SOPMOD buttstock, and B5 took that proven layout and built it out with the features serious rifle guys actually ask for. The result is a collapsible stock that fits mil-spec receiver extensions, shoulders with confidence, and holds up to hard use without turning into a heavy brick.
What Sets the Enhanced SOPMOD Apart
The standout here is the cheek weld. It runs wider and fuller than the slim-profile stocks out there, which gives you a repeatable, natural spot to plant your face behind an optic. Folks who have run both tend to reach for the SOPMOD when they want more cheek real estate without piling on the weight of a bulky precision stock. On a true mil-spec buffer tube it sits snug with minimal rattle, and the SureGrip stock latch makes adjusting length of pull quick and predictable.
Built From Glass-Reinforced Polymer
This thing is made from glass-reinforced polymer with color-matched steel hardware, so it shrugs off knocks, weather, and range grime. The no-slip cushioned buttpad keeps the rifle anchored in your shoulder even when things get slick, and while it is not a heavy recoil pad, that grippy texture matters more on a 5.56 than soft cushioning ever would. Overmolded steel anti-rotation QD sling mounts plus fixed sling mounts give you flexible attachment points on either side.
Storage Where You Need It
Two water-resistant compartments are molded right into the body, sized for spare optic batteries or small essentials you want riding with the gun. It is a simple, functional detail that keeps you from digging through a bag mid-session. Keep in mind the receiver extension, or buffer tube, is not included, so you will want a mil-spec tube on hand to mount it. Proudly made in the USA, this is one of those upgrades that just works and stays out of your way.
Key Specifications
- Manufacturer: B5 Systems
- Manufacturer Part Number: SOP-1074
- UPC: 814927020009
- Model: SOPMOD
- Color: Black
- Material: Glass-Reinforced Polymer with Steel Hardware
- Stock Type: Collapsible
- Fit: Mil-Spec Receiver Extension
- Compatibility: AR-15 / M4 Platform
- Sling Mounts: Anti-Rotation QD and Fixed Sling Mounts
- Storage: Dual Water-Resistant Compartments
- Weight: 11.80 oz
- Length: 10.20 in
- Height: 4.90 in
- Country of Origin: United States of America
What’s Included
- B5 Systems Enhanced SOPMOD Stock (Black)
Frequently Asked Questions
Does the B5 SOPMOD stock come with a buffer tube?
No, the receiver extension or buffer tube is not included with this stock. You will need a mil-spec diameter buffer tube to mount it. If you already have a standard AR-15 carbine setup, it slides right on and locks up snug.
Will the Enhanced SOPMOD stock fit a commercial buffer tube?
This model is built specifically for mil-spec diameter receiver extensions, not commercial ones. Most modern AR-15 builds run mil-spec tubes, so it is compatible with the majority of setups. If you are unsure which tube you have, measure the outside diameter or check your rifle's spec sheet before ordering.
How is the cheek weld on the B5 SOPMOD compared to slimmer stocks?
The SOPMOD profile runs wider and fuller than slim stocks like the CTR or MOE, giving you more cheek contact and a more repeatable head position behind an optic. Users who want a solid cheek weld without adding the bulk of a precision stock tend to favor this one. It is a common reason people choose the SOPMOD over slimmer options.
What can I store in the SOPMOD stock compartments?
The two water-resistant compartments are molded into the body and are sized well for spare optic batteries, small tools, or other compact essentials. They keep useful items riding with the rifle instead of buried in a bag. The seals help keep moisture and debris out during rough use.






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