5.56 8.1″

SKU: STU5181-S7S
Price $675.00
SKU: STU5181-S7S

Shipping & Returns

Financing Available

Shipping & Returns

Return Authorization is required for all returned merchandise. Please email johnd@spikestactical.com  or call 407.928.2666 to acquire a Return Merchandise Authorization Number (RMA.)

Review our complete Return Policy

Financing Available

Complete the credit application. You will be asked to provide your basic information. Click Here to apply.

How It Works

Minimum $750 Order

Description

Specs

Description

Our complete upper assemblies will arrive to you inspected, tested, and ready to drop-in and go to work. We maintain our high standard of tolerances and attention to detail as the uppers we use for complete rifle builds. Every built upper and complete gun is test fired before leaving our facility for function check before it reaches you. We offer several rail choices and rail lengths. Use the drop bar to make your selection.

NOTE:  All uppers are built to order.  Due to high demand we are currently running 1-2 weeks out for new orders.

Specs

Forged Upper Receiver

  • 7075 T6 Construction
  • Forward Assist
  • Ejection Port Door
  • Ejection Port Door Spring
  • Ejection Port Door Rod

  • 8.1" Cold Hammer Forged Barrel

  • DIN 21CrM0V511
  • 1/7 Twist Rate
  • 1/2 X 28 Thread Pitch for Muzzle
  • 5.56 Nato Chamber
  • .750 Gas Block Seat
  • M4 NIB Coated Barrel Extension
  • Black Nitride Coating

  • 7" SAR3 Rail

  • 7075 T6 Barrel Nut
  • 6061 T6 Rail
  • Continuous Top Rail
  • Free Floating 1 Piece
  • Q.D. Attachment Points

  • Low Profile Gas Block

  • Solid Billet Steel
  • .750 I.D

  • Pistol 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

  • 1/2" Crush Washer

  • Weight: 3lb 5oz