Feature Overview

• Spike's Tactical 16", 1:7 Twist, Mil-spec Barrel
• M4 Barrel Profile, Carbine Length Gas System
• ST Micro Gas Block, .750" Diameter Gas Seat
• Spike's Tactical Mil-spec M16 Bolt Carrier Group
• ST BAR Rail System
• A2 Flash Hider
• Spike's Tactical Lifetime Warranty

Upper Specs Spike's Tactical M4 Flat Top Upper Receiver

• CNC Machined from a 7075 T6 MIL-H-6088 Forging
• Extended M4 Feed Ramps Machined before Plating
• Mil-Spec 1913 Picatinny Rail
• MIL-A-8625F Type III Class 2 Hardcoat Anodized Finish
• Laser Engraved T-markings
• Laser Engraved ST Spider logo
• Interior MIL-L-46010 Dryfilm Lube
• Mil-Spec Ejection Port Door Assembly with 5.3.1.2 MIL-STD-171 Phosphate Finish
• Mil-Spec Forward Assist Assembly with Tool Steel Pawl and 5.3.1.2 MIL-STD-171 Phosphate Coating
• Forged Mil-Spec Charging Handle with MIL-A-8625F Type III Class 2 Hardcoat Anodized Finish

Barrel Group

• Barrel Steel is Certified MIL-B-11595E Chromoly Vanadium Alloy
• Raw Barrel Steel is Magnetic Particle Inspected
• Barrels are Stress Relieved
• Mil-Spec M4 Barrel Extension with 5.3.1.2 MIL-STD-171 Phosphate Finish
• 1.2.2.2 MIL-STD-171 Hard Chrome Chamber
• 1.2.2.2 MIL-STD-171 Hard Chrome Bore
• 5.56mm Nato chamber
• All Chambers are Individually Checked for Head Spacing Before and After Plating
• All Barrels are Individually High Pressure Tested (HPT) and then Individually Magnetic Particle Inspected (MPI)
• 5.3.1.2 MIL-STD-171 Phosphate Finish on the Barrel Exterior, Including under the Front Sight Base
• 1/2x28 Thread Pitch
• Threads are Cut Concentric to the Bore
• Gas Block or FSB is Pinned to the Barrel and Vertically Aligned
• Rubber Coated Front Sling Loop
• Mil-Spec 303 Stainless Steel Gas Tube enhanced with Melonite Finish
• Muzzle Devices are Properly Timed and installed with Crush Washer

Fore End Group

• Spike's Tactical BAR Rail System
• CNC Machined from 6061 Extrusion with MIL-A-8625F Type III Class 2 Hardcoat Anodized Finish
• Steel ST BAR Barrel Nut with 5.3.1.2 MIL-STD-171 Phosphate Coating
• Featuring 5 QD Swivel Sockets for multi-fuction sling attachment
• Wide Body design accommodates counter sunk suppressor bodies up to 1.6" in diameter

Bolt Carrier Group

• Mil-Spec 8620 Tool Steel M16 Bolt Carrier with Shrouded Firing Pin
• Carrier is 5.3.1.2 MIL-STD-171 Phosphate Coated inside and out with 1.2.2.2 MIL-STD-171 Hard Chrome Bore
• Laser Engraved with ST Spider Logo
• Mil-Spec Tool Steel Carrier Key
• Carrier Key is 5.3.1.2 MIL-STD-171 Phosphate Coated inside and out with 1.2.2.2 MIL-STD-171 Hard Chrome Bore
• Carrier Key is installed with Grade 8 Hardware and Properly Staked
• Bolt is CNC Machined from Carpenter-158 Steel
• Bolt is 5.3.1.2 MIL-STD-171 Phosphate Coated inside and out
• All Bolts are Shot Peened per current Mil-Spec Requirements
• All Bolts are Individually High Pressure Tested (HPT) and then Individually Magnetic Particle Inspected (MPI)
• Tool steel Extractor is Shot Peened, 5.3.1.2 MIL-STD-171 Phosphate Coated, Fitted with a Mil-Spec Black Extractor Spring Insert and Mil-Spec Viton O-Ring
• Mil-Spec Firing Pin with 1.2.2.2 MIL-STD-171 Hard Chrome Finish
• Mil-Spec Cam Pin with 5.3.1.2 MIL-STD-171 Phosphate Coating
• Mil-Spec Firing Pin Retaining Pin with 5.3.1.2 MIL-STD-171 Phosphate Coating