FMR-15 Stripped Fixed Magazine Receiver

Massachusetts Compliant AR-15

The FMR-15 is a complete, factory-built 5.56 AR-15 designed for buyers who live in states with assault weapon and magazine capacity restrictions. Every receiver ships from our Massachusetts shop with the Gen 3 fixed magazine system already installed. Massachusetts, California, New York, New Jersey, Connecticut, Illinois, Maryland, Washington State, Rhode Island, Delaware, and Washington DC residents can buy the receiver and skip the pinning kits, the conversion work, and the worry about getting a build wrong. The compliance hardware is built in at our factory.

What You Get

Complete factory-built AR-15 receiver
Gen 3 Fixed Magazine System pre-installed (Cross Armory pinning system)
Magpul GEN M3 10 round PMAG, pinned in place
Hard anodized receiver, Mil-Spec 8625 Type 3 Class 2
7075-T6 forged aluminum
Made in USA

Who This Receiver Is For

The FMR-15 is built for buyers in ban states who want a working, factory-clean AR-15 without doing their own compliance conversion. If you live in:

Massachusetts
California
Connecticut
Delaware
Illinois
Maryland
New Jersey
New York
Rhode Island
Washington DC
Washington State
…the FMR-15 is built with your state’s magazine and feature restrictions in mind.

How the Gen 3 Fixed Magazine System Works

Many state assault weapon laws define a regulated firearm partly by whether the magazine can be removed without disassembling the rifle. The Gen 3 system uses the Cross Armory pinning system to fix the magazine in place, which takes the rifle out of that definition while keeping normal cycling and operation. The Cross Armory platform is widely discussed in the compliance community as one of the more reliable and reversible solutions on the market.

Build Specs

Caliber: MULTI
Receiver: 7075-T6 forged aluminum, hard anodized Mil-Spec 8625 Type 3 Class 2
Compliance System: Mass Rifle Co Gen 3 with Cross Armory pinning
Origin: Made in USA

Frequently Asked Questions

Q: Does this ship as a complete rifle?
A: Yes. The FMR-15 ships fully assembled with the Gen 3 fixed magazine system already installed.

Q: Do I need to do any conversion work when it arrives?
A: No. The compliance hardware is installed at our factory before shipping.

Q: Will this be fully compliant in my state?
A: The FMR-15 is built around the magazine and feature restrictions in the listed states, but state laws also regulate other features and configurations. Verify your full build with your state’s current law before purchase.

Q: How does the rifle get shipped to a buyer in a restricted state?
A: As with any rifle purchase, the FMR-15 ships to a licensed FFL in your state who will complete the transfer to you.

Q: What does the Cross Armory pinning system do?
A: It secures the magazine in a fixed position so the rifle cannot accept a removable magazine in normal use, which is one component of state assault weapon compliance.

Important Legal Notice

Firearm laws vary by state and locality. Customers are solely responsible for verifying that their firearm configuration complies with all applicable federal, state, and local laws before purchase, installation, transfer, or use.