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Spikes Tactical 5.56 M4 16in Forged Upper Receiver Up to 10% Off w/ Free S&H — 20 models

Special offer available for this product. Click here to see!
Spikes Tactical ST-15LE Carbine Upper 5.56, 16in, M4 Profile Barrel, A2 Front Sight Base, Black, STU5025-M4S
Spikes Tactical ST-15LE Carbine Upper 5.56, 16in, M4 Profile Barrel, A2 Front Sight Base, Black, STU5025-M4S
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE BLK SL Handguard STU5025-SLB
Spikes Tactical Upper 5.56 16in M4 LE w/BLK MOE Handguard & FSP STU5025-MOS
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE Grey SL Handguard STU5025-SLG
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE FDE SL Handguard STU5025-SLF
Spikes Tactical Upper 5.56 16in M4 LE w/FDE MOE Handguard & FSP, STU5025-MOF
Spikes Tactical Upper 5.56 16in M4 LE w/7in BAR2 Rail & FSP STU5025-R7S
Spikes Tactical ST-15Law Enforcement Carbine Upper 5.56, 16in, M4 Profile Barrel, Quad Rail, Black, STU5025-R9S
Spikes Tactical ST-15Law Enforcement Carbine Upper 5.56, 16in, M4 Profile Barrel, Quad Rail, Black, STU5025-R9S
Spikes Tactical Upper 5.56 16in M4 LE w/10in BAR2 Rail STU5025-R1S
Spikes Tactical Upper 5.56 16in M4 LE w/12in BAR2 Rail STU5025-R2S
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in BAR2 Rail STU5025-R3S
Spikes Tactical Upper 5.56 16in M4 LE w/10in M-LOK Rail STU5025-M1S
Spikes Tactical Upper 5.56 16in M4 LE w/7in M-LOK Rail & FSP, STU5025-CM7FP
Spikes Tactical Upper 5.56 16in M4 LE w/7in SAR3 Rail & FSP, STU5025-CQ7FP
Spikes Tactical Upper 5.56 16in M4 LE w/9in M-LOK Rail, STU5025-CM9F
Spikes Tactical Upper 5.56 16in M4 LE w/9in SAR3 Rail, STU5025-CQ9F
Spikes Tactical Upper 5.56 16in M4 LE w/12in M-LOK Rail, STU5025-CM2F
Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F
Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in SAR3 Rail, STU5025-CQ3F
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in M-LOK Rail, STU5025-CM3F
Spike's Tactical 5.56 M4 Carbine 16in Complete Upper, with M4 Handgaurd, Black, STU5025-M4S
Spike's Tactical 5.56 M4 Carbine 16in Complete Upper, with M4 Handgaurd, Black, STU5025-M4S
Spikes Tactical ST-15LE Carbine Upper 5.56, 16in, M4 Profile Barrel, A2 Front Sight Base, Black, STU5025-M4S
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Spikes Tactical ST-15LE Carbine Upper 5.56, 16in, M4 Profile Barrel, A2 Front Sight Base, Black, STU5025-M4S
Spikes Tactical ST-15LE Carbine Upper 5.56, 16in, M4 Profile Barrel, A2 Front Sight Base, Black, STU5025-M4S
2 of 25 images
Spikes Tactical ST-15LE Carbine Upper 5.56, 16in, M4 Profile Barrel, A2 Front Sight Base, Black, STU5025-M4S
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE BLK SL Handguard STU5025-SLB
3 of 25 images
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE BLK SL Handguard STU5025-SLB
Spikes Tactical Upper 5.56 16in M4 LE w/BLK MOE Handguard & FSP STU5025-MOS
4 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/BLK MOE Handguard & FSP STU5025-MOS
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE Grey SL Handguard STU5025-SLG
5 of 25 images
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE Grey SL Handguard STU5025-SLG
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE FDE SL Handguard STU5025-SLF
6 of 25 images
Spikes Tactical Upper 5.56 16in ST-15 M4 LE Carbine w/MOE FDE SL Handguard STU5025-SLF
Spikes Tactical Upper 5.56 16in M4 LE w/FDE MOE Handguard & FSP, STU5025-MOF
7 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/FDE MOE Handguard & FSP, STU5025-MOF
Spikes Tactical Upper 5.56 16in M4 LE w/7in BAR2 Rail & FSP STU5025-R7S
8 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/7in BAR2 Rail & FSP STU5025-R7S
Spikes Tactical ST-15Law Enforcement Carbine Upper 5.56, 16in, M4 Profile Barrel, Quad Rail, Black, STU5025-R9S
9 of 25 images
Spikes Tactical ST-15Law Enforcement Carbine Upper 5.56, 16in, M4 Profile Barrel, Quad Rail, Black, STU5025-R9S
Spikes Tactical ST-15Law Enforcement Carbine Upper 5.56, 16in, M4 Profile Barrel, Quad Rail, Black, STU5025-R9S
10 of 25 images
Spikes Tactical ST-15Law Enforcement Carbine Upper 5.56, 16in, M4 Profile Barrel, Quad Rail, Black, STU5025-R9S
Spikes Tactical Upper 5.56 16in M4 LE w/10in BAR2 Rail STU5025-R1S
11 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/10in BAR2 Rail STU5025-R1S
Spikes Tactical Upper 5.56 16in M4 LE w/12in BAR2 Rail STU5025-R2S
12 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/12in BAR2 Rail STU5025-R2S
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in BAR2 Rail STU5025-R3S
13 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in BAR2 Rail STU5025-R3S
Spikes Tactical Upper 5.56 16in M4 LE w/10in M-LOK Rail STU5025-M1S
14 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/10in M-LOK Rail STU5025-M1S
Spikes Tactical Upper 5.56 16in M4 LE w/7in M-LOK Rail & FSP, STU5025-CM7FP
15 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/7in M-LOK Rail & FSP, STU5025-CM7FP
Spikes Tactical Upper 5.56 16in M4 LE w/7in SAR3 Rail & FSP, STU5025-CQ7FP
16 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/7in SAR3 Rail & FSP, STU5025-CQ7FP
Spikes Tactical Upper 5.56 16in M4 LE w/9in M-LOK Rail, STU5025-CM9F
17 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/9in M-LOK Rail, STU5025-CM9F
Spikes Tactical Upper 5.56 16in M4 LE w/9in SAR3 Rail, STU5025-CQ9F
18 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/9in SAR3 Rail, STU5025-CQ9F
Spikes Tactical Upper 5.56 16in M4 LE w/12in M-LOK Rail, STU5025-CM2F
19 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/12in M-LOK Rail, STU5025-CM2F
Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F
20 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F
Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F
21 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in SAR3 Rail, STU5025-CQ3F
22 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in SAR3 Rail, STU5025-CQ3F
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in M-LOK Rail, STU5025-CM3F
23 of 25 images
Spikes Tactical Upper 5.56 16in M4 LE w/13.2in M-LOK Rail, STU5025-CM3F
Spike's Tactical 5.56 M4 Carbine 16in Complete Upper, with M4 Handgaurd, Black, STU5025-M4S
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Spike's Tactical 5.56 M4 Carbine 16in Complete Upper, with M4 Handgaurd, Black, STU5025-M4S
Spike's Tactical 5.56 M4 Carbine 16in Complete Upper, with M4 Handgaurd, Black, STU5025-M4S
25 of 25 images
Spike's Tactical 5.56 M4 Carbine 16in Complete Upper, with M4 Handgaurd, Black, STU5025-M4S

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Questions & Answers
Will this M4 receiver fit on and work with an AR-15 lower? I have a Spikes tactical spider complete lower What makes it an M4?

Yes it will fit, M4 is only the style, that being. 16in barrel, A2 front sight, carbine length gas system, and flat top receiver. A true M4 would be select fire, but other than having a milspec BCG, all that is done in the lower receiver. and all parts from an M4 minus a couple that require the lower to have an extra pin hole are cross compatible with AR-15s.

by Tim, Verified Owner, May 24, 2021
Is the barrel 16 inch alone, or 14.5 inch and including the flash hider makes it 16 inch ? Expert Answer

The barrel alone is 16in.

by Todd, Gear Expert, August 5, 2021
View All Q&A You Have a Question? Ask!
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ATTENTION! We currently do not ship this product to AK, CA, HI, IL, NY, WA, P.O. Boxes, and U.S. Territories. Please see our policies for more information.

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Spikes Tactical 5.56 M4 16in Forged Upper Receiver

Drop the Spikes Tactical 5.56 M4 Carbine 16in Forged Upper Receiver right into your current build to create a powerful and reliable firearm for sport shooting, self-defense or tactical needs. These AR15 Upper Receivers developed by Spikes Tactical is crafted from 7075 T6 aluminum that's rugged and lightweight to survive harsh conditions without inhibiting your mobility. This Spikes Tactical 5.56 M4 Carbine 16in Forged Upper Receiver Kit comes with everything you need to upgrade your complete upper, and that includes a Mil-Spec phosphate coated barrel that resists corrosion and harmful elements. Snag a Spikes Tactical 5.56 M4 Carbine 16in Drop-In Upper Receiver to create a premium weapon build that will result in powerful and precise shots with each pull of the trigger.image

Specifications for Spikes Tactical 5.56 M4 16in Forged Upper Receiver:

Manufacturer: Spikes Tactical
Caliber: 5.56x45mm NATO
Barrel Length: 16 in
Color: Black
Gun Model: AR-15
Condition: New
Weight: 2 lb
Magazine Included: No

Features of Spikes Tactical 5.56 M4 16in Forged Upper Receiver:

  • 7075 T6 Construction
  • Forward Assist
  • Ejection Port Door
  • Ejection Port Door Spring
  • Ejection Port Door Rod
  • 16in M4 Profile Barrel:
  • MIL-B-11595E CMV
  • Chrome Lined
  • 1/7 Twist Rate
  • 1/2 X 28 Thread Pitch for Muzzle
  • 5.56 Nato Chamber
  • .750 Gas Block Seat
  • M4 Feed Ramped Barrel Extension
  • Mil-Spec Phosphate Coating
  • Carbine Gas Tube:
  • Black Nitride Inside and Out
  • Gas Tube Roll Pin
  • Charging Handle:
  • Forged Aluminum
  • Mil-Spec Type 3 Coating
  • Phosphate M16 Complete BCG:
  • Phosphate Coated
  • Laser Engraved with ST Spider logo
  • High Pressure Tested (HPT)
  • Magnetic Particle Inspected (MPI)
  • A2 Flash Hider:
  • 0.5in Crush Washer

Package Contents:

  • Spikes Tactical 5.56 M4 16in Forged Upper Receiver

What firearm models does the manufacturer say Spikes Tactical 5.56 M4 16in Forged Upper Receiver is compatible with?

The manufacturer suggests that Spikes Tactical 5.56 M4 16in Forged Upper Receiver is compatible with AR-15

Spikes Tactical 5.56 M4 16in Forged Upper Receiver Orderable Models

List of Orderable Models

  • Spikes Tactical Upper 5.56 16in M4 LE w/MOE BLK SL Handguard, STU5025-SLB , MPN: STU5025-SLB , UPC: 815648024529 , Code: 2A8-UFH-STU5025-STU5025-SLB
  • Spikes Tactical Upper 5.56 16in M4 LE w/10in M-LOK Rail, STU5025-M1S , MPN: STU5025-M1S , UPC: 815648021191 , Code: 2A8-UFH-STU5025-STU5025-M1S
  • Spikes Tactical Upper 5.56 16in M4 LE w/9in BAR2 Rail, Black, STU5025-R9S , MPN: STU5025-R9S , UPC: 815648021085 , Code: 2A8-UFH-STU5025-R9S
  • Spikes Tactical Upper 5.56 16in M4 LE w/M4 Handgaurd, Black, STU5025-M4S , MPN: STU5025-M4S , UPC: 815648021030 , Code: 2A8-UFH-STU5025-M4S
  • Spikes Tactical Upper 5.56 16in M4 LE w/BLK MOE Handguard & FSP, STU5025-MOS , MPN: STU5025-MOS , UPC: 815648021054 , Code: 2A8-UFH-STU5025-STU5025-MOS
  • Spikes Tactical Upper 5.56 16in M4 LE w/MOE Grey SL Handguard, STU5025-SLG , MPN: STU5025-SLG , UPC: 815648024543 , Code: 2A8-UFH-STU5025-STU5025-SLG
  • Spikes Tactical Upper 5.56 16in M4 LE w/MOE FDE SL Handguard, STU5025-SLF , MPN: STU5025-SLF , UPC: 815648024536 , Code: 2A8-UFH-STU5025-STU5025-SLF
  • Spikes Tactical Upper 5.56 16in M4 LE w/FDE MOE Handguard & FSP, STU5025-MOF , MPN: STU5025-MOF , UPC: 815648021047 , Code: 2A8-UFH-STU5025-STU5025-MOF
  • Spikes Tactical Upper 5.56 16in M4 LE w/7in BAR2 Rail & FSP, STU5025-R7S , MPN: STU5025-R7S , UPC: 815648021078 , Code: 2A8-UFH-STU5025-STU5025-R7S
  • Spikes Tactical Upper 5.56 16in M4 LE w/10in BAR2 Rail, STU5025-R1S , MPN: STU5025-R1S , UPC: 815648021092 , Code: 2A8-UFH-STU5025-STU5025-R1S
  • Spikes Tactical Upper 5.56 16in M4 LE w/12in BAR2 Rail, STU5025-R2S , MPN: STU5025-R2S , UPC: 815648021108 , Code: 2A8-UFH-STU5025-STU5025-R2S
  • Spikes Tactical Upper 5.56 16in M4 LE w/13.2in BAR2 Rail, STU5025-R3S , MPN: STU5025-R3S , UPC: 815648021115 , Code: 2A8-UFH-STU5025-STU5025-R3S
  • Spikes Tactical Upper 5.56 16in M4 LE w/7in M-LOK Rail & FSP, STU5025-CM7FP , MPN: STU5025-CM7FP , UPC: 810083260426 , Code: 2A8-UFH-STU5025-STU5025-CM7FP
  • Spikes Tactical Upper 5.56 16in M4 LE w/7in SAR3 Rail & FSP, STU5025-CQ7FP , MPN: STU5025-CQ7FP , UPC: 810083260488 , Code: 2A8-UFH-STU5025-STU5025-CQ7FP
  • Spikes Tactical Upper 5.56 16in M4 LE w/9in M-LOK Rail, STU5025-CM9F , MPN: STU5025-CM9F , UPC: 810083260433 , Code: 2A8-UFH-STU5025-STU5025-CM9F
  • Spikes Tactical Upper 5.56 16in M4 LE w/9in SAR3 Rail, STU5025-CQ9F , MPN: STU5025-CQ9F , UPC: 810083260495 , Code: 2A8-UFH-STU5025-STU5025-CQ9F
  • Spikes Tactical Upper 5.56 16in M4 LE w/ 12in SAR Rail, STU5025-CQ2F , MPN: STU5025-CQ2F , UPC: 810083260457 , Code: 2A8-UFH-STU5025-STU5025-CQ2F
  • Spikes Tactical Upper 5.56 16in M4 LE w/12in M-LOK Rail, STU5025-CM2F , MPN: STU5025-CM2F , UPC: 810083260396 , Code: 2A8-UFH-STU5025-STU5025-CM2F
  • Spikes Tactical Upper 5.56 16in M4 LE w/13.2in SAR3 Rail, STU5025-CQ3F , MPN: STU5025-CQ3F , UPC: 810083260464 , Code: 2A8-UFH-STU5025-STU5025-CQ3F
  • Spikes Tactical Upper 5.56 16in M4 LE w/13.2in M-LOK Rail, STU5025-CM3F , MPN: STU5025-CM3F , UPC: 810083260402 , Code: 2A8-UFH-STU5025-STU5025-CM3F

Spikes Tactical 5.56 M4 16in Forged Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • Spikes Tactical Upper 5.56 16in M4 LE w/BLK M-LOK Handguard & FSP, STU5025-MMS , MPN: STU5025-MMS , UPC: 815648021061 , Code: 2A8-UFH-STU5025-STU5025-MMS
  • Spikes Tactical Upper 5.56 16in M4 LE w/FDE M-LOK Handguard & FSP, STU5025-MMF , MPN: STU5025-MMF , UPC: 815648025649 , Code: 2A8-UFH-STU5025-STU5025-MMF
  • Spikes Tactical Upper 5.56 16in M4 LE w/10in SAR3 Rail, STU5025-S1S , MPN: STU5025-S1S , UPC: 815648021146 , Code: 2A8-UFH-STU5025-STU5025-S1S
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