Details
Aphelion 7.5 Inch 5.56 NATO AR-15 Pistol Full Build Kit with SB Tactical SBA3 Brace and Black Diamond Billet Upper
7.5 inch 4150 Chrome Moly Vanadium barrel in 5.56 NATO with 1:7 twist rate, contour profile, phosphate finish, pistol length gas system, micro low profile gas block, Black Diamond Series slick side billet upper receiver made from 6061-T6 aluminum with Type III hard coat anodized finish, 7 inch freefloat M-LOK handguard, nitride finished 9310 steel bolt carrier group, mil-spec M4 charging handle, 6-position buffer tube, 3 oz carbine buffer and spring, SB Tactical SBA3 adjustable pistol stabilizing brace, and GI birdcage flash hider. This pistol full build kit delivers ultra-compact AR-15 performance with all major components needed except the lower receiver.
Key Features
- 7.5 inch 5.56 NATO barrel made from 4150 Chrome Moly Vanadium with contour profile, phosphate finish, and 1:7 twist rate stabilizing bullets from 55 to 77 grains
- Pistol length gas system provides reliable cycling with the shortest standard gas tube length, optimized for barrels under 10 inches
- Black Diamond Series slick side billet upper receiver made from 6061-T6 aluminum with Type III hard coat anodized finish and no forward assist for streamlined profile
- Micro low profile gas block sits flush under the handguard with minimal height
- 7 inch freefloat M-LOK handguard allows M-LOK accessory mounting while covering most of the barrel length for a clean appearance
- Nitride finished 9310 steel bolt carrier group provides enhanced surface hardness and corrosion resistance
- SB Tactical SBA3 adjustable pistol stabilizing brace with multiple position adjustment and minimalist design
- Complete buffer system includes 6-position buffer tube, 3 oz carbine buffer, spring, castle nut, and end plate
- 1/2x28 threaded muzzle with manganese phosphate finished GI birdcage flash hider compatible with 5.56 NATO suppressors and muzzle devices
Perfect For
- Ultra-compact builds prioritizing maximum maneuverability in confined spaces
- Backpack or vehicle carry where every inch of length matters
- Shooters wanting a distinctive slick side upper with a proven stabilizing brace
- Home defense applications in tight quarters where barrel length improves handling
7.5 Inch Pistol Length Configuration
The 7.5 inch barrel length creates an ultra-compact package with significantly reduced overall length compared to standard carbine configurations. The 1:7 twist rate stabilizes heavier 5.56 NATO bullets in the 62 to 77 grain range, though velocities will be substantially reduced compared to longer barrels. The contour profile tapers from chamber to muzzle, balancing weight distribution while maintaining structural integrity. The phosphate finish protects against corrosion and provides a durable non-reflective surface. The pistol length gas system uses the shortest standard gas tube length, positioning the gas port closer to the chamber to ensure adequate gas pressure for reliable cycling with the limited barrel length. The micro low profile gas block sits flush under the handguard without creating a visible hump. Expect significant muzzle flash and concussion with this barrel length, particularly with standard ammunition.
Black Diamond Series Slick Side Billet Upper
The Black Diamond Series billet upper receiver is machined from a solid block of 6061-T6 aluminum and features a slick side design without a forward assist. The absence of the forward assist creates a streamlined profile, reduces weight, and simplifies the upper receiver design. The slick side look appeals to builders who prefer a cleaner aesthetic or who consider the forward assist unnecessary for their intended use. The billet construction allows for precise tolerances and distinctive styling compared to standard forged uppers. The Type III hard coat anodized finish provides superior wear resistance compared to standard Type II anodizing, creating a harder surface that better resists scratches and abrasion from extended use.
SB Tactical SBA3 Pistol Stabilizing Brace
The SB Tactical SBA3 is an adjustable pistol stabilizing brace with a minimalist split design that reduces weight while maintaining structural integrity. The brace adjusts across five positions on the buffer tube for different length of pull settings, allowing customization for different shooting scenarios and user preferences. The polymer construction provides a contact surface for stabilizing the firearm while keeping overall weight down. The SBA3 has become one of the most popular pistol braces due to its balance of adjustability, low weight, and secure lockup at each position. The brace attaches to the included 6-position buffer tube.
Nitride Bolt Carrier Group and M-LOK Handguard
The 9310 steel bolt carrier group features nitride finish across all surfaces, providing superior corrosion resistance and lubricity compared to traditional phosphate finishes. The nitride process diffuses nitrogen into the steel surface, creating a hardened layer that resists wear and reduces friction. This means smoother cycling, easier cleaning, and longer component life. The mil-spec M4 charging handle provides standard ergonomics and reliable operation. The 7 inch freefloat M-LOK handguard extends nearly to the muzzle device on the 7.5 inch barrel, maximizing accessory mounting space while maintaining the compact profile. The M-LOK slots on the sides and bottom allow direct attachment of lights, grips, and other accessories using M-LOK compatible mounts. The freefloat design means the handguard does not contact the barrel, eliminating pressure points that can shift point of impact as the barrel heats.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Lower receiver not included.
