Product Info

At SpecOp Manufacturing we believe in Quality Mil-Spec or better parts. We believe there is no substitute for quality and that your gun should be built right the first time, ready for hard use right out of the box. We believe in our products and we back them up with a lifetime warranty. Our weapons our meant to be used hard and go in harm’s way, they won’t let you down. 

Here at SpecOp MFG we do not include the Bolt Carrier Group or the Charging handle because we want our customer to order what they want right from the beginning. We believe the customer should always get what they want and not spend extra money on parts that are going to be changed out anyways. Please select your options for bolt carrier group and charging handle.

Below you will find the complete specifications on the SpecOp Basic 16 Upper Half 5.56 We have built our guns to run through years of hard use, and we have nothing to hide.


Barrel Components:

  • Barrel: SpecOp MFG 16” 4150 Chrome Moly Vanadium MPI HPT Barrel
  • Caliber: 5.56 NATO Chamber
  • Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E) 
  • Twist Rate: 1/8 Twist 
  • Thread Pitch: 1/2X28 Threaded Muzzle
  • Gas Block: .750″ Gas Block Journal with appropriately sized gas port
  • Barrel Finish: QPQ Corrosion Resistant Finish
  • Barrel Extension: QPQ coated M4 Feed Ramp Extension
  • High Pressure (proof) Tested (HPT)
  • Magnetic Particle Inspected (MPI)

Upper Receiver: 

  • Material: Made from Mil-Spec 7075-T6 aluminum Cerra Forge forgings.
  • Exterior Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, NiAc Seal
  • Interior Finish: Dry Film Lube
  • Gas Block: SpecOp MFG Lo-Pro Gas block made from 4140 Steel with a Phosphate Coating.
  • Gas Tube: Stainless Steel


Gas Block:

  • 4140 Billet Gas Block Manufactured from a 1”x1.25” Block of Steel
  • .750 Profile
  • 2 – Set Screw Design
  • Phosphate Finish


Gas Tube:

  • Stainless Steel
  • Carbine Length
  • Made in the USA



  • T6 Aluminum Body
  • Modular (MOD LITE) Skeletonized Series- Just Released!
  • Total Weight Including Barrel Nut Is 8.4 oz!!
  • Lightest 15" Handguard In Product Line
  • M-LOK Slots On 4 Sides of Handguard (Top, Bottom, Left & Right Sides)
  • M-LOK Slots On Top Rail Allow For Multiple Optic / Accessory Positioning
  • Triangle / Diamond Skeletonized Cuts Throughout Handguard to Reduce Weight
  • Rail System Slides Over Barrel Nut , And Is Locked Up Against Receiver With 6 Screws
  • Tight Fit Up Against Receiver, Which Allows For A Monolithic Top Rail
  • 15" Length
  • Heavy Duty
  • Internal Diameter: 1.34"



  • Lifetime Warranty

SpecOp MLKS Upper Half 5.56 Nato


Availability : Current Production Lead Time is 1 to 2 Weeks


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