Integrity Arms/Blackhole Weaponry 18in SPR Tack Driver – .223 Wylde Polygon



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Blackhole Weaponry has established a prestigious and unprecedented benchmark for excellence in barrel manufacturing with our proprietary rifling and stainless steel. Caudle 3-land polygonal rifling consists of a series of arcs, which is held in very high regard for its accuracy, increased velocity, reduced gas cutting, and ease of cleaning. We only use a tightly controlled blend of fully-vetted and certified, F-Bar rated, BOSS 416R steel, recognized as the finest ordnance steel available. We had these barrels produced to our blueprint for the profile. We believe the weight and profile together, along with the legendary accuracy of Blackhole Weaponry, puts these barrels to the front of the pack for performance.
  • 18in Barrel
  • Rifle Length Gas
  • 3 Groove Polygon Rifling
  • 416R Stainless Steel
  • Black Oxide Coated
  • Weighs 37 Ounces
  • Match Grade Wylde Chamber (223 or 5.56)
  • 1/2×28 TPI
  • .750 Gas Block
  • Extended/M4 Feed Ramps
  • 1-8 Twist Rate
  • Sub-Moa Accuracy Guarantee
Matching BCG SPECS (read full description HERE)
  • M16 profile 5.56/223/300BLK
  • Nitrided throughout assembly, including carrier and key
  • Carrier is Case Hardened 8620
  • Bolt is Case Hardened 9310 (7% stonger than C158)
  • True MIL-SPEC Dimension Bolt. External Surfaces Are CNC Ground After Heat Treat For Precision Fit
  • Magnetic Particle Tested/Marked
  • High Pressure Tested (Batch)
  • Shot Peened to Stress Relieve/Increase Tensile Strength
  • Extractor is heat treated 4140 alloy steel per MIL-SPEC w/ Crane (NAVSPECWAR) O-Ring & Spring
  • Extractor is Shot Peened per MIL-SPEC to Increase Tensile Strength
  • Gas Key is Heat Treated 4140 Steel Attached w/Grade 8 Fasteners Properly Staked Into Milled "Valley" To Ensure Proper Positioning
  • Cam Pin Is Hardened 4340 Steel
  • Firing Pin is Mil Spec 8740 Steel, Center-Less Ground and Hard Chrome Coated
  • Manufactured by a Current ISO 9001 Certified Company
  • All Parts Are 100% Made in the USA

Additional information

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