Ultimate Assassin

SKU: STR5692-S2S


SKU: STR5692-S2S

FFL required for shipment. You must disclose which FFL will be receiving this item in the SPECIAL INSTRUCTIONS box during checkout. Failure to do so will delay your order processing and shipping. If your FFL is not already on file, have them fax a signed copy of their license to (866) 283-2215 and reference your name and order number on the cover sheet.


Shipping & Returns

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 $500 Order




BACKORDER: Due to high demand, builds are estimated to take 12-18 months at this time.  

NOTE: We are currently experiencing higher than normal demand for firearms. We are fulfilling orders as quickly as possible. Thank you for your patience.

NOTE:  All complete rifles are built to order.

The Ultimate Assassin is designed with input from our 3 gun team and other competitors. Minimal recoil, target transition at depth, and weight are their primary concerns. The Ultimate Assassin is the billet counterpart to our Black Assassin and has many upgrades to give you an out of the box performance rifle.



Billet Upper Receiver

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

  • 14.5" Mid Length CHF Barrel

  • Cold Hammer Forged Optimal Profile
  • 20,000+ Round Service Life
  • DIN 21CrM0V511
  • Chrome Lined to M249 Spec
  • 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

  • 12" 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.

  • Mid Length Gas Tube

  • Black Nitride Inside and Out
  • Gas Tube Roll Pin

  • Charging Handle

  • Radian Raptor-SD 5.56
  • MilSpec Type 3 Coating

  • Nickel Boron M16 Complete BCG

  • Nickel Boron Coated
  • Laser Engraved with ST Spider logo
  • High Pressure Tested (HPT)
  • Magnetic Particle Inspected (MPI)

  • Dynacomp

  • Pin and Welded (16" OAL)

  • Magpul Pro Front and Rear Sights

    Gen II Billet Lower

  • Raised Spider Logo
  • Raised Bullet Pictogram Selector Markings
  • 7075 T6 Forged Receiver
  • Multi Caliber
  • MIL-A-8625F Type III Class 2 Hard Coat Anodized Finish
  • Low Shelf, RDIAS Compatible
  • Proprietary Ambidextrous Controls
  • Built in Trigger Guard
  • KNS Mod ST Anti Rotation Pins

  • Lower Parts

  • Spike's Tactical Battle Trigger
  • Battle Arms Safety
  • Magpul MOE Grip
  • S.T. Billet Latch Plate
  • 6-Position Mil-Spec Buffer Tube, Castle Nut
  • 17-7 Stainless Buffer Spring
  • ST-T2 Buffer
  • Magpul CTR Stock with Extended Butt Pad

  • (Rifle includes hard case and manual)

    Weight: 6lb 10oz
    Length: Position 1- 32"
    Position 6- 35"