Colt M4 SOCOM Block 1 Carbine — CCC Custom Build with 14.5" Pinned Barrel and KAC RAS | The Workhorse of GWOT
The M4A1 SOPMOD Block 1 is the rifle that fought the Global War on Terror from 2001 through the mid-2010s. This configuration — a Colt M4 receiver with a 14.5" SOCOM-profile barrel, Knight's Armament RAS handguard, and Colt factory internals — was the standard carbine for USSOCOM, Army Rangers, and conventional infantry units across Iraq and Afghanistan. CCC's custom Block 1 build uses 100% factory Colt and KAC components assembled to military specification.
What Makes This a Block 1
The SOPMOD Block 1 kit was the first standardized accessory package for the M4A1, fielded starting in 1994. The defining feature of the Block 1 carbine is the KAC M4 RAS (Rail Adapter System) — a two-piece, four-rail handguard that replaced the M4's plastic handguards and provided mounting points for lights, lasers, and vertical grips. The Block 1 configuration uses a Colt 14.5" SOCOM-profile barrel with a carbine-length gas system and front sight base. This CCC build has the barrel pinned and welded with a flash hider to achieve the legal 16" OAL, so it does not require SBR registration.
Factory Parts, Not Reproductions
This rifle is built on a genuine Colt M4 lower receiver with Colt internals and a Colt 14.5" SOCOM barrel. The KAC RAS is a genuine Knight's Armament product, not a clone or reproduction rail. CCC assembles these builds to ensure correct torque specs, headspace, and function — every rifle is inspected before shipping. This is the Block 1 as it was issued, built from the same manufacturers who supplied the military.
Complete Your Block 1 Kit
→ Mil-Spec M4A1 Vertical Foregrip (VFG)
→ Upgrade to Block II — M4A1 SOPMOD Upper with DD RIS II
Ships as a firearm; FFL transfer required. For Block 1 and Block 2 M4A1 builds, CCC has been the source for genuine Colt and KAC components since 2017.
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.
