TRIARC Systems TSR-15S 8.3 .556 / 300BLK ENTRY GUN – SBR or PISTOL

The TRIARC 8.3 .556/300blk Entry Gun is a full rifle-caliber build in a compact footprint, engineered for high performance in mission-critical scenarios. It features our proprietary 8.3″ TRACK 2.0 barrel—machined from 4150 CrMoV with a BLACKNITRIDE™ finish and an NP3-coated barrel extension—delivering sub-MOA precision with reduced fouling and increased barrel life.

A 7″ TRILOK wedge-lock handguard secures to a steel barrel nut, providing strength and modular flexibility with full seven-sided M-LOK compatibility. The core of the system is our hand-matched TSR15 upper and lower receiver set, serialized for precision alignment and traceability.

Additional included features:

• Radian LT ambidextrous charging handle
• TRIARC Enhanced mil-spec trigger group
• Standard nitride bolt carrier group (BCG) with NP3 upgrade available
• Ambi 90° safety selector
• Pinned TRIARC low-profile gas block
• Magpul K2 grip
• Milspec buffer system with optional A5 upgrades
• SBA3 brace (pistol) or Magpul SLK stock (SBR)

Available Variations:

• SBR
• Pistol

Add-On Options:

Final build does not include base items as the upgrade replaces the item being upgraded.

• BCG: Nitride (base) or NP3 +$130.89
• Muzzle Device: (includes professional installation by our expert gunsmith)
  • Standard A2 Flash Hider (Base)
    MIL-SPEC flash hider included with all base models.
  • Dead Air KeyMo Flash Hider (DAF) – +$89.00
    Low-signature flash hider compatible with Dead Air suppressor mounts (KeyMo). 1/2×28 thread.
    Timing required. Pinning included with TRIARC install.
  • Dead Air KeyMo Muzzle Brake (DAB) – +$89.00
    Three-port brake offering effective recoil control. Supports Dead Air suppressors via KeyMo interface. 1/2×28 thread.
    Timing required. Pinning included with TRIARC install.
  • HUXWRX Flash Hider QD 5.56 (HUX) – +$129.00
    Non-directional QD flash hider for HUXWRX suppressors. Adds ~1.7″ to barrel. Threads 1/2×28.
    No timing or pinning required.
  • SureFire Warcomp Flash Hider (SFW) – +$134.00
    Multi-function flash hider with integrated compensation ports. Adds ~2.4″ to barrel. Suppressor-ready. Threads 1/2×28.
    Timing required. Pinning included with TRIARC install.
• Buffer System: Mil-spec anodized (base); A5 Black Ano / A5 Type III Hard Coat Ano (optional)
• LAW Tactical Folder (+$200) – replaced stock for SBR configuration
• Optic options
  • Aimpoint PRO Patrol Rifle Optic (Red Dot): $490
    Rugged, duty-grade 2 MOA red dot with excellent battery life and proven reliability. Ideal for compact AR platforms.
    Installation included; zero not included.
  • Steiner MPS Micro Pistol Sight: $550
    Low-profile reflex sight with 3.3 MOA dot and ACRO footprint. Lightweight and durable for pistol-length deployment.
    Installation included; zero not included.
  • EOTech EXPS3 Holographic Weapon Sight: $770
    Fast-acquisition holographic sight rated for CQB use; compatible with night-vision devices and robust QD operation.
    Installation included; zero not included.
  • Holosun HS510C Multi-Reticle Red Dot : $310
    Solar-powered open reflex sight combining a 2 MOA dot and 65 MOA circle reticle. Long battery life and compact footprint.
    Installation included; zero not included.
• Cerakote or laser engraving available upon request

Technical Highlights:

• TRACK 2.0 rifling: Single-Edge Polygonal (SEP) profile for improved velocity, tighter gas seal, and longer barrel life
• TRILOK handguard: Wedge-lock interface, 7 M-LOK faces, maximum rigidity
• Matched receiver sets: Hand-assembled, serial-paired, optimized for balance and reliability
• Professional-grade parts standardization: Enhanced trigger, gas system, BCG coatings, and buffer system