Colt M4 Lower Receiver — "Carbine" Marked, Stripped | The Authentic Foundation for Your M4 Clone
There is no substitute for the real thing. This is a genuine Colt M4 lower receiver — carbine marked, stripped, and pulled from current production rifles bearing the QR code on the magazine well and the CR serial number prefix. If you are building a clone-correct M4 or a high-fidelity AR15, this is the lower receiver the job demands.
What Makes This Lower Special
Colt changed their production lower in recent years — these are 2020/2021 production receivers, machined to the same mil-spec tolerances as the M4 Carbines issued to U.S. military units. The "Carbine" roll mark is correct for standard M4 configurations. The receiver is cut from 7075-T6 aluminum forgings and finished with Colt's hard anodize. Every dimension is genuine — not "mil-spec compatible," but actually mil-spec, made by Colt.
Charlie's has been sourcing authentic Colt components since 2017 specifically because clone builders need the genuine article. When the lower receiver itself says "Colt" and was made by Colt, the foundation of your build is unimpeachable.
Who This Is For
Clone builders targeting M4, M4A1, or general-purpose AR15 configurations where the lower must be authentic Colt. Collectors who want a new-production Colt lower without the price premium of a complete rifle. Anyone who understands that the lower receiver is the serialized heart of the build — and it should be right.
What You Should Know Before Buying
This is a stripped lower — no trigger group, no pistol grip, no buffer tube or stock. It ships as a firearm and requires transfer through your FFL. The "Carbine" marking makes this correct for standard M4/M4A1 configurations; it is not marked as M16 or full-auto. Accepts all mil-spec components.
Complete Your M4 Build
→ Geissele Super Duty Lower Parts Kit
→ M4A1 SOPMOD Block 2 Complete Upper
→ Daniel Defense Complete Lower (assembled alternative)
Questions about the right lower for your specific clone build? The CCC team has been answering exactly these questions since 2017 — reach out anytime.
THIS IS A SERIALIZED FIREARM. It must ship to a Federal Firearms License holder. No civilian exceptions.
Buying and shipping through Charlie’s is easy, but there is some information you need to know. Only a federally licensed firearms dealer may receive a firearm or federally regulated serialized item (like a receiver or suppressor). We cannot ship these items directly to you. Please follow these steps to process your transaction:
1) Check your state laws to make sure the federally regulated item you want to purchase is legal in your state. Your FFL dealer should be able to give you all of the necessary information regarding your state specific laws. But, if we ship to your FFL, and there is a legal issue, we cannot accept a return. So please make sure that you know and follow your local and state laws.
2) A quick google search will show you what Federal Firearms Licensed (FFL) dealers are in your area. When you are ready to purchase, contact the FFL dealer you would like to use and get their shipping address. During the check-out, put YOUR address in the “billing” section and the FFL DEALER’S address in the “shipping” section. If you don’t know your FFLs address, that’s okay. You can send the information later.
3) After check out, make sure to contact your FFL dealer to ensure they will receive your shipment for you (most do this for a small fee, but you should always double check).
4) Have your dealer send us a copy of their FFL to FFL@CharliesCustomClones.com. Charlie’s does not reach to your FFL (MAKE THEM EARN THEIR FEE!!!)
5) Be patient! In order to ensure we remain compliant with all federal laws, our compliance department is kept separate from our sales and operations team. Please allow a few days for our compliance officer to verify all of your dealer’s documents and ensure all federal laws are being observed. You should hear from our compliance department within 3-4 business days. If not, feel free to reach out for a status update.
That’s it! We try to make this process as simple as possible for our customers, but if you are unfamiliar the process or have any other questions, please visit our How to Buy a Firearm page for more details.
California and New York residents please, click here. The process may be different due to state specific laws.
NOTE: The free shipping option does not apply to full rifles, unless purchased with a riflescope. If you choose free shipping at check-out, we will bill you for shipping later.
