Custom .300 Blackout Build Component Breakdown
Complete component specification and itemized breakdown for the custom .300 Blackout Upper Receiver Assembly and lower receiver buffer system built by Heart of Texas Armory.
Upper Receiver Assembly
| Component Title & Details | SKU / Part # | Price |
|---|---|---|
| Luth-AR Flattop Upper Receiver Assembly Mil-Spec forged 7075-T6 aluminum, fully assembled with forward assist & dust cover |
FTT-EA1 | $129.95 |
| Breek Arms Sledgehammer AR-15 Ambidextrous Gas-Bust Charging Handle (Black) Features dual-latch engagement and gas redirection shelf for suppressed shooting |
BRK6015 | $69.99 |
| RISE Armament Premium M16 Bolt Carrier Group (Black Nitride) Fully assembled M16 cut BCG with durable low-friction nitride finish |
RA-1011-BLK | $145.00 |
| CMMG 8.0" .300 Blackout Pistol-Length AR-15 Barrel (Salt Bath Nitride) 8.0" medium taper, 5/8x24 thread pitch, salt bath nitride finish inside and out |
30D810A | $160.00 |
| Bravo Company USA BCM MCMR-8 M-LOK Free Float Handguard (Black) Slim-profile 6061-T6 aluminum handguard with full-length top rail and M-LOK slots |
BCM-MCMR-8-556-BLK | $176.95 |
| Superlative Arms .750" Adjustable "Bleed-Off" Gas Block (Clamp-On) Patented Bleed-Off technology reduces fouling and blowback for suppressed tuning |
SABO-DI-750CM | $95.00 |
| WMD Guns NitroMet Pistol-Length Gas Tube (Black) Stainless steel tube treated with NitroMet QPQ salt bath nitride finish |
1-NMGTPL | $14.00 |
| Fortis Manufacturing RED Muzzle Brake 7.62mm / .300 BLK (Nitride Black) Precision-machined 4140 steel muzzle brake designed to minimize recoil and muzzle rise |
F-RED-762 | $60.00 |
| Upper Assembly Subtotal: | $850.89 | |
Lower Receiver Component
Multi-weight recoil system for lower assembly and cycle tuning:
| Component Title & Details | SKU / Part # | Price |
|---|---|---|
| Armaspec Stealth Recoil Spring Multi-Weight Tuning Kit (AR-15) Self-contained, drop-in recoil system featuring interchangeable spring weights to fine-tune cycling, reduce felt recoil, and eliminate buffer tube noise. |
ARM253-AR15KIT | $95.00 |
| Lower Component Subtotal: | $95.00 | |
| Combined Build Total: | $945.89 |
