Product Info

SpecOp ULK15V6 FDE 5.56 Nato

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. 

The SpecOp ULK15V6 FDE 5.56 is meant as a building block for any build you wish to do. It is built with all high quality components. At SpecOp Manufacturing we always tell our customers, Buy Quality, Buy Perfection, Buy SpecOp.

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 ULK15V6 FDE 5.56 NatoWe have built our guns to run through years of hard use, and we have nothing to hide.


Barrel Components:

Barrel: SpecOp MFG 16” 4150 CoMOV 1:7 MPI HPT Barrel
Caliber: 5.56 NATO Chamber
Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E) 
Twist Rate: 1/7 Twist 
Thread Pitch: 1/2-28 Threaded Muzzle
Gas Block: .750″ Gas Block Journal with appropriately sized gas port
Weight: 19 Ounces
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
T-Marks: Engraved T-Marks

Gas Block: SpecOp MFG Lo-Pro Gas block made from 4140 Steel with a Phosphate Coating.

Gas Tube: Stainless Steel

Muzzle Device:

SpecOp Standard A2 1/2x28  with Crush Washer


SpecOp Ultra-Light Keymod Handguard 15”

Material: Aircraft Grade 6061-T6 Aluminum
Finish: FDE
Length: 15”
Inside Diameter: 1.340"
Continuous Top Rail
Made in the USA!


Weight: 3LBS 2oz

SpecOp ULK15V6 5.56 Upper Half - FDE


Availability : Current Production Lead time is 4 Weeks.


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