New for 2014, Spike’s Tactical announced that their line of ST-15 upper receivers are now available for .300 Blackout. The upper receivers are CNC machined from a 7075 T6 MIL-H-6088 forging, have extended M4 feed ramps and a Mil-Spec 1913 Picatinny rail for mounting optics and accessories. In addition, these receivers have a hard coat anodized finish, laser-engraved T-markings, an interior MIL-L-46010 Dryfilm lube, and a Mil-Spec ejection ports, forward assists, and charging handles. See below for more details.

Features
-Spike’s Tactical 10.0″, 1:8 Twist, LW-50 Stainless Steel Barrel
-Medium Barrel Profile, Carbine Length Gas System
-F-Marked FSB, .750″ Diameter Gas Seat
-Spike’s Tactical Mil-spec M16 Bolt Carrier Group
-M4 Double Heatshield Handguards
-Threaded 5/8×24 (Concentric to the Bore) includes an A2 Flash Hider

Barrel Group
-Barrel Steel is LW-50 Stainless
-Raw Barrel Steel is Magnetic Particle Inspected
-Barrels are Stress Relieved
-Mil-Spec M4 Barrel Extension with Nickel Boron Finish
-300 Blackout chamber
-All Chambers are Individually Checked for Head Spacing
-All Barrels are Individually Magnetic Particle Inspected (MPI)
-5/8X24 Thread Pitch
-Threads are Cut Concentric to the Bore
-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
-M4 Double Heatshield Handguards
-F Marked Front Sight Base with Milspec Phosphate Finish
-Steel Milspec Barrel Nut with 5.3.1.2 MIL-STD-171 Phosphate Coating

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

For more information about Spike’s Tactical and their products, visit www.spikestactical.com