The Aim Sports Complete Build Kit 5.56x45mm NATO 10.50" – AR5CUB9 (UPC: 815879019943) is a turnkey AR-15 pistol build kit designed for shooters who want a high-quality, compact 5.56 setup with rugged components and modern features. Featuring a 10.50" black nitride 4150 CMV barrel, 7075-T6 aluminum black anodized receiver, and a 10" free-float M-LOK handguard, this kit gives you a strong foundation for a reliable, accurate, and customizable AR-15 pistol platform. readygunner.com+1
If you’re seeking a 10.5" AR-15 pistol kit that balances durability, performance, and value, the Aim Sports AR5CUB9 stands out as a complete solution from a trusted brand.
Product Highlights
Caliber: 5.56x45mm NATO (also accepts .223 Remington) Cheaper Than Dirt
Barrel Length: 10.50" 4150 Chrome Moly Vanadium (CMV) steel
Barrel Finish: Black nitride for enhanced wear and corrosion resistance firearmsdepot.com+1
Receiver: Mil-spec forged 7075-T6 aluminum, Type III hard-coat black anodized firearmsdepot.com+1
Handguard: 10" free-float M-LOK handguard
Muzzle Device: A2 muzzle brake / flash hider, 1/2x28 threads OpticsPlanet+1
Gas System: Carbine-length gas with low-profile gas block OpticsPlanet+1
Bolt Carrier Group: 8620 steel carrier, 9310 tool steel bolt, nitride finish
Includes: Complete upper assembly, BCG, charging handle, lower parts kit, AR pistol buffer tube kit aimsportsinc.com+2RK Guns+2
Model: AR5CUB9
UPC: 815879019943
Compact 10.5" 5.56 NATO Performance
The heart of this build kit is its 10.50" 4150 CMV barrel chambered in 5.56x45mm NATO, delivering a compact package without sacrificing reliability. firearmsdepot.com+1
4150 Chrome Moly Vanadium steel is known for strength and longevity under high round counts.
Black nitride treatment provides improved hardness, lubricity, and corrosion resistance, making it ideal for demanding environments. firearmsdepot.com+1
Threaded 1/2x28 with an A2 muzzle device, the barrel is ready for common AR-15 muzzle accessories and upgrades. OpticsPlanet+1
This combination makes the kit suitable for range use, training, and general-purpose AR-15 pistol applications where maneuverability is key.
Mil-Spec Forged 7075-T6 Aluminum Receiver
At the core of the kit is a mil-spec forged 7075-T6 upper receiver finished in a durable Type III hard-coat anodizing for long-term durability. firearmsdepot.com+2alpinerange.com+2
Forged 7075-T6 offers outstanding strength-to-weight, exceeding many basic commercial receivers.
Type III anodizing provides abrasion and corrosion resistance, ideal for hard use.
Includes dust cover and forward assist for a complete, functional upper assembly. OpticsPlanet+1
This receiver is built to handle the rigors of regular shooting and pairs seamlessly with standard AR-15 lowers (sold separately).
10" Free-Float M-LOK Handguard for Modern Accessories
The 10" free-float M-LOK handguard gives you extended rail space on a compact pistol platform while keeping weight down. Cheaper Than Dirt+1
Free-float design helps support consistent accuracy by avoiding pressure on the barrel.
M-LOK slots allow you to add lights, grips, sling mounts, and other accessories exactly where you need them.
The 10" length delivers a full, comfortable support-hand position on a 10.5" barrel setup, enhancing control and handling.
For shooters building a modern AR-15 pistol, this handguard is ready for mission-specific customization.
Reliable Carbine-Length Gas System
This kit uses a carbine-length gas system with a low-profile gas block, a proven configuration for 10.5" 5.56 builds. OpticsPlanet+1
Carbine gas balances reliability and cycling in shorter barrels.
Low-profile gas block fits cleanly under the M-LOK handguard for a streamlined look and feel.
Designed to deliver reliable function with a wide range of quality 5.56/.223 ammunition.
The result is a smooth-running AR-15 pistol upper that’s ready for serious range time once properly configured and tested.
Nitride Bolt Carrier Group & Charging Handle Included
A key advantage of this kit is that it includes a complete bolt carrier group (BCG) and charging handle, eliminating guesswork and extra shopping. aimsportsinc.com+2OpticsPlanet+2
8620 steel carrier with a 9310 tool steel bolt, both finished in nitride for enhanced wear resistance and lubricity. OpticsPlanet+2firearmsdepot.com+2
Full-auto profile BCG for mil-spec compatibility and robust performance. firearmsdepot.com+1
Standard charging handle included so the upper is ready to run once properly matched with a lower and other necessary components.
Having a matched BCG and upper from the same kit supports consistent fit and function.
Complete Lower Parts Kit & Buffer Tube Assembly
Beyond the upper, this Aim Sports kit also provides the key components typically required for your lower (receiver not included). Classic Firearms+3aimsportsinc.com+3RK Guns+3
Complete lower parts kit (LPK), including:
Fire control group (trigger, hammer, related small parts)
Standard A2-style grip
Pins, springs, and other lower internals
AR pistol buffer tube kit, including:
Pistol buffer tube
3.0 oz buffer
Carbine buffer spring
Castle nut and end plate
By including both an LPK and buffer assembly, the kit offers a consolidated solution for those assembling an AR-15 pistol configuration using a compatible lower.
Built for AR-15 Pistol Builders & Enthusiasts
The Aim Sports AR5CUB9 Complete Build Kit is an excellent choice for:
Shooters wanting a compact 10.5" 5.56 AR-15 pistol setup with quality components.
Builders who prefer a single, brand-matched kit instead of sourcing each part individually.
Enthusiasts who value nitride-treated steel, 7075-T6 receivers, and M-LOK modularity in one package.
Whether this is your first AR-15 pistol project or your latest custom build, this kit simplifies parts selection while still offering performance-oriented features.
Technical Specifications
Brand: Aim Sports
Model: AR5CUB9 – Complete AR-15 Build Kit
Caliber: 5.56x45mm NATO (also accepts .223 Remington) Cheaper Than Dirt+1
Barrel Length: 10.50"
Barrel Material: 4150 CMV steel, black nitride finish firearmsdepot.com+2alpinerange.com+2
Muzzle Threads: 1/2x28 with A2 muzzle device OpticsPlanet+1
Handguard: 10" free-float M-LOK
Receiver Material: Mil-spec forged 7075-T6 aluminum, Type III hard-coat anodized firearmsdepot.com+2alpinerange.com+2
Gas System: Carbine length, low-profile gas block
Bolt Carrier Group: 8620 carrier, 9310 bolt, nitride finish, full-auto profile OpticsPlanet+2firearmsdepot.com+2
Included Components: Complete upper assembly, BCG, charging handle, lower parts kit, AR pistol buffer tube kit Classic Firearms+3aimsportsinc.com+3RK Guns+3
UPC: 815879019943
For builders who want a reliable, compact, and modern 5.56x45mm NATO AR-15 pistol kit, the Aim Sports Complete Build Kit AR5CUB9 offers a well-balanced combination of materials, features, and value.
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