ARM4kitA2shown
The ARM-4 kit, this kit comes in A-3 Flat top only.

16" barrel ARM-4 Military specifications Kit

The highest quality, most accurate to military  M-4 Rifle Kit with specifications that are made for the everyday civilian  today.  This kit contains, a 4150 steel Barrel that is chrome lined with a 1X7 twist rate and made to withstand higher temperatures for sustained rates of fire, Each barrel is Magnafluxed which compared to Magnetic Particle Inspection, is virtually the same( read Faq's for more info).  M-4 Feed ramps, double heat shielded M-4 style hand guards, A-3 Flat top, T marked Upper receiver, F  front sight, AR-15 LPK made by the same manufacturer as Colt, and 6 position M-4 style buttstock.  This kit is the closest to the M-4 military rifle anyone can build.  We will follow up with the shorter 14.5" version for SBR rifles soon.  This rifle kit comes with a fully assembled upper.  You will need to purchase a stripped lower receiver, use the LPK parts included in the kit to make this a operational firearm.

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16" ARM-4 Chrome Lined, 4150, 1x7 Twist, F Sight Base, M-4 Feed Ramps, Flat top A-3 Kit.

16" ARM-4 Chrome Lined, 4150, 1x7 Twist, F Sight Base, M-4 Feed Ramps, Flat Top A-3 Kit with Bolt, Bolt Carrier and Charging handle

16" ARM-4 Chrome Lined, 4150 steel, 1x7 Twist, F Sight Base, M-4 Feed Ramps, 6 position M-4 style buttstock, Magnafluxed barrel, LPK, Flat Top Kit.
The highest quality, most accurate to military  M-4 Rifle specifications that is made for the everyday civilian  today.  This kit contains, a 4150 CV steel Barrel that is chrome lined with a 1X7 twist rate and made to withstand higher temperatures for sustained rates of fire, Each barrel is Magnafluxed which compared to Magnetic Particle Inspection, is virtually the same( read Faq's for more info).  M-4 Feed ramps, double heat shielded Oval M-4 style hand guards, A-3 Flat top, T marked Upper receiver, F  front sight, AR-15 LPK made by the same manufacturer as Colt, and 6 position M-4 style buttstock.  This kit is the closest to the M-4 military rifle anyone can build.