Here is one of our favorite custom builds. We decided to try and rebuild the old school C7 M-16A1 Carbine These are using a true M-4 carbine barrel with a 1/7 twist. The barrel is made of 41V50 steel and the chamber/bore is chrome lined. We use a Extended A1 or A2 Bird cage flash hider on it then pin and weld to complete compliance with the 16" OAL length rule. By doing so this is not a NFA/SBR item. C7 Upper receiver is black finished. Handguards are single wall Mil-Spec.
The 80's and 90's saw major changes to the modern duty rifles carried by US forces. Most notable the adoption of the carbine gas system and shorter barrel over the longer rifles. These advancements where directly related to the requests from special forces units such as SOF-D, Army Rangers, and Navy SEALs. The 723 and 727 were the precursor to the modern M4 we all know today.
Upper: TNTE 7075-T6 C7 with Black Type III hard coat with M4 ramps
Barrel: TNTE 14.5" 5.56 1/7 Chrome Lined barrel with 1/2x28 thread
Gas System: Carbine
Gas Block: Pinned on standard height A2 FSB
Handguard: Two Piece Carbine
Flash Hider: Extended A2
Charging Handle: Optional
Take a look at this great article about our upper http://www.gunsandgunsmiths.com/retro-ar-project/
Other DetailsAll TNTE uppers are custom built using exacting tolerances by highly trained armorers. Your receiver and barrel are torqued to a spec of 55-65 +/- for best accuracy. Then your feed ramps and chamber are polished and de-burred. All uppers are checked for proper head-spacing and test fired to ensure reliability. Beware of sellers who refuse to tell you where their parts come from because all uppers are not created equal. We use only Milspec or higher quality parts for your upper. TNTE uppers are built with professionals in mind, we go through them with a fine tooth comb to make sure when you need it most it will be there for you. Our custom stripped uppers are covered by a one year warranty. Complete uppers have a limited lifetime warranty.
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Received mine after 2 months. Very happy with this upper. Craftsmanship is on point and performa very well! Perfect fit for my Aimpoint 3000. Would very much recommend.