Whether you are a veteran military rifle owner or shooter, or you are new to military correct rifles and clone building or collecting, the fact is pretty simple: We all want a Block 1. Many clone enthusiasts start with an M4A1 Block 1. The M4 rifle system has been the main infantry rifle since the 1990s, building upon the M16 platform that has served the US military and its allies since the 1960s, the M4 rifle became ever more popular with its shorter barrel and quad rail, the M4A1 gave the solider the ability to carry more, move around, and mount optics and lighting like never before. The Block 1 is the most common M4 rifle, and components are still widely accessible.
Here, Charlie's brings you a Colt based M4A1 Block 1 full upper receiver, with your ability to customize it to suit your needs and your personal preferences, while keeping the cost affordable. This full upper receiver group is based upon the Colt upper receiver platform, which will fit Colt and other forged mil spec lower receivers like Lego parts.
The barrel is pinned and welded, overall barrel length is LEGAL at 16.1”. Colt Upper Receiver and barrel. All Genuine Colt. Standard Extended A2 flash hider and Colt 14.5” SOCOM profile barrel.
"Street legal" pinned flash hider, makes this item legal to own without an NFA tax stamp. A few surface scratches, which, if you buy new Colt, you know are common. This is a highly desired and sought after upper.
The upper comes with complete with a mil-spec M4 RAS handrail with 3 ribbed covers, Colt heavy profile SOCOM barrel (standard SOCOM with M203 cuts), Matech Picatinny Logo rear BUIS and mil-spec complete BCG. Still heavy with factory oil, not shot. This is a new upper, with the upper receiver, barrel, and the front sight base has been timed and installed by Colt. This is an "F" height FSB, although Colt is not marking all FSBs with the "F" Yes, bolt, barrel and upper receiver all have Colt markings that you would expect.*
--- Accommodates the full range of 5.56mm ammunition, including the NATO M855/SS109 and U.S. M193, as well as longer-range ammo like the Mk262 Mod1 77 grain, preferred for SOCOM operations, utilizing a rifling twist of 1 turn in 7".
Note: Standard configuration is NOT an NFA item. If you choose the unpinned barrel, all NFA laws will apply.
Note to Maryland customers: The SOCOM barrel is a heavy barrel, similar to a HBAR, so you may purchase this and own it.
Charlie's also stocks the FN SOCOM M4A1 upper receiver group
Note: All ITAR regulations apply. Charlie's deals in the real McCoy, which is subject to export restrictions.
Note: Some Colt barrels are being shipped with the front sight base (FSB) not being marked with an "F". All upper receivers are factory Colt receivers, whether the receiver has or does not have a CAGE Code. Some pictures depicts Knights Armament branded RAS rails and covers and vertical grip. These are older pics, and the specs above have the exact same hardware, from PAT.