The Stoner platform is renowned for its modularity and the JAG Upper exemplifies that versatility with a reliable, fully equipped design. Perfect for new shooters looking to build their ideal rifle or experienced marksmen seeking a ready-to-run solution, the JAG Upper requires only the addition of a lower receiver to be range-ready. As Lead & Steel's intermediate-tier rifle option for the commercial market, it incorporates many features from the all-rounder carbine, delivering a balance of performance, quality and value. Designed to bridge the gap between rifle tiers, the JAG stands as a high-quality, dependable choice that lives up to its reputation-Just As Good.

L&S's 4150CMV, stress-relieved, 1/7 twist mid-length barrel is gas nitro carburized for longevity and delivers match-grade accuracy with Black Hills MK262 ammunition
Barrels undergo batch HP/MPI testing and are accuracy-tested at 100 yd to ensure superior performance
The gas port is drilled to 0.078 inches, ensuring a smoother shooting experience while maintaining reliable extraction and ejection in various environmental conditions
The JAG rail is free-floated and secured via a wedge locking system, made of 6061-series aluminum, with a continuous 12 o'clock 1913 section and multiple M-LOK attachment points for accessories
L&S's 7075 forged receiver set, inspired by the ARC series, includes an M16 FCG pocket and type III hard coat anodizing for increased durability and longevity
L&S utilizes the 4140CMV machined quality gas block (QGB), secured with degreased, thread-locked, serrated gas block screws torqued to 25 in/lb for paralleled thermal expansion
Backed by a lifetime warranty, ensuring long term reliability and customer satisfaction

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.