Spike's Tactical 16" M4 LE 5.56 Upper with 9" BAR Free Float Quad Rail FACTORY INSTALLED (STU5025-R9S)

M4 upper built with 9" SPIKE'S BAR RAIL PACKAGE (INCLUDES: 3 LADDER RAIL COVERS AND QD SLING SWIVEL), SPIKE'S COMPLETE BOLT CARRIER GROUP and SPIKE'S FORGED CHARGING HANDLE.  This would be a great foundation for your next rifle and is arguably the best quality and value upper on the market.  This Spike's Tactical Upper is setup with the new Spike's super lightweight free float quad rail handguard and includes a low profile gas block for concealment under this mid-length hand guard.  The barrel is 4150 Chromoly Vanadium Alloy, with a 1:7 twist. This is marked under the handguards. Magnetic particle testing is conducted on every barrel, and each is phosphate coated. The barrels of the Spike's Tactical 16" M4 LE are individually proof fired and MP Inspected. The 16" M4 profile barrel is using a carbine length gas system. In speaking with Tom Miller (CEO of ST), he pointed out that Spike's Tactical is proud to use barrels which are turned on center and have threads which are 100% concentric to the bore. The importance of this is well known in the suppressor community. More than a few people have found a baffle or end strike due to a barrel that wasn't quite squared away.  

Gas tube alignment on the ST 16" M4 LE is what I would consider text book perfect.  Even small alignment issues will eventually create wear on the gas tube, which makes for longer term trouble. Regardless of whether you want to get worked about about gas tube, carrier keys, and perfect alignment, its not an issue with this upper receiver.  The Spike's Tactical 16" M4 LE comes with a M16 Bolt Carrier.  Machine work is top quality, and the parkerized finish is even. The inside of the carrier and gas key are chrome lined. The lining is also even, and without blemish or high spots. Carrier Key has proper staking, is forged and Milspec, and using grade 8 fasteners. The bolt as shot peened, proof fired, and MP Inspected. This goes for each bolt in the Spike's Tactical 16" M4 LE, these are not batch tested. Each bolt is marked MP. The extractors are machined from solid bar stock, heat treated, and phosphate coated. These come with the Milspec black insert, and viton O-ring. These touches should ensure positive extraction with all ammunition, even if you've been less than stellar with your cleaning of the chamber. The gas rings are tight, and provide a solid seal. Placing the bold into the carrier is reassuring, and may remind you that some of your other BCGs are nearing gas ring replacement. Each Spike's Tactical upper come test fired, as do their complete rifles. While that may seem trivial to some people, its nice to know that someone is overseeing the builds, checking function and verifying QC before the item goes out the door.

 Upper Specs:

-Spike's Tactical M4 flat top upper receiver, Machined from a 7075 T6 Mil-Spec Forging with Mil-Spec Type III Hardcoat Anodized finish, T-markings, our logo and M4 feed ramps. Mil-Spec Dryfilm lube on the inside.

-Barrel is 4150 Chromoly Vanadium Alloy, M4 barrel extention, Chrome chamber and bore, 5.56mm Nato chamber, 1:7 Twist, Magnetic particle testing on every barrel, Phosphate finish.

-M4 Profile with Carbine length gas system.

-The M16 carriers are Chrome lined with a Mil-Spec phosphate finish.

-Forged Mil-Spec charging handle

-Bolt Carrier Specs: - Machined from 8620 Tool Steel -Chrome lined -Mil-Spec phosphate finish -Forged Mil-Spec chrome lined carrier key attached with Grade 8 hardware and Properly staked.

-Bolts Specs: - Machined from Mil-Spec Carpenter 158 Steel – Shot Peened - Magnetic Particle Inspected - Mil-Spec Extractor Spring - Mil-Spec Black Extractor Insert - Mil-Spec Viton O-Ring - Tool Steel Extractor - Mil-Spec Phosphate Finish.

Spike's Tactical 9" BAR rail system

 BAR rail system specs-

-The BAR rail system is a 1pc free float design

-The BAR rail is Machined from 6061-T6 Aluminum, The barrel nut is Machined from 7075-T6 Aluminum 

-Type III Hardcoat Anodized Black on the rail and barrel nut, The rail is also Engraved with our Logo 

-Built in Anti-Rotation tabs to eliminate the rail OR barrel nut coming loose

-The BAR offers excellent heat ventilation, and sexy styling

-Scalloped rails (Gentle on your hands without using rail covers)

-5 Built in QD sockets (Sling attachment points)

-Rail attaches to the barrel nut w/ (8) T-20 Grade 8 Torx screws

-Continuous top rail

**All SPIKE'S products carry a LIFETIME Warranty**