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B5 Systems
Overview
The B5 Systems AR-15 SOPMOD Stock is an adjustable, collapsible stock designed for Mil-Spec buffer tubes, providing versatility for a wide range of shooting positions and user preferences. Made from durable polymer, this stock enhances the overall functionality of your AR-15 while maintaining a lightweight profile. This stock is frequently found in builds with a Mid-Length gas system chambered in 5.56 NATO, making it a solid choice for both tactical applications and recreational shooting.
B5 Systems AR-15 SOPMOD Stock Collapsible Mil-Spec Coyote Brown
Prices checked
Builders on GunPartPicker first added the B5 Systems AR-15 SOPMOD Stock Collapsible Mil-Spec Coyote Brown to a build in February 2026.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 6 of the 9 retailers we track have it in stock. Prices barely moved in September 2026, holding around $78.99, so there haven't been real sales lately. Buying today, the lowest price is $93.99 at Brownells, above September's low of $78.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every stock & brace by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Stock Popularity Report →Check it against the live catalog:
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