If you're located in Brandon, Tampa, Valrico, Riverview, or the surrounding Florida areas and looking to build your own custom AR-15, Gas & Brass Armory is your one-stop shop. We carry everything you need to start and finish your build—whether it’s your first rifle or a performance-tuned upgrade for competition or defense.

In this guide, we’ll walk you through how to build a custom AR-15 using high-quality parts available locally at our Brandon gun store. Our experienced staff is here to guide you through every step of the process, from choosing components to assembling your rifle.

Why Build Your Own AR-15?

• Customization: Tailor your rifle to fit your purpose—hunting, home defense, competition, or tactical.
• Cost Control: Pick parts based on your budget, upgrading where it matters most.
• Performance: Get exactly what you want in terms of trigger response, weight, balance, and accuracy.
• Education: Learn how your firearm functions and how to maintain or upgrade it.

Step-by-Step: Building Your AR-15 in Brandon, FL

1. Choose Your Lower Receiver

The lower receiver is the legal firearm component and the base of your AR-15 build. At Gas & Brass Armory, we offer a variety of stripped and complete lower receivers from trusted brands like Aero Precision, Anderson Manufacturing, Spike’s Tactical, and Sons of Liberty Gun Works.

Bring your Florida ID and complete the ATF Form 4473 in store. Our staff will guide you through the required NICS background check.

? FREE gunsmithing available when you buy your parts from us (minimum $50 purchase).

2. Select a Matching Upper Receiver

Our store stocks both stripped and complete upper receivers to suit any build:

• M4-style forged uppers
• Billet uppers for high-end builds
• Monolithic and side-charging uppers

3. Pick a Quality Barrel

Your barrel is the heart of your AR-15’s accuracy. Choose from calibers like 5.56 NATO, .223 Wylde, .300 Blackout, and 6.5 Grendel. We carry barrels in lengths from 10.5" to 20" in nitrided, chrome-lined, and stainless steel finishes.

4. Choose Your Handguard / Rail System

From lightweight M-LOK to full quad rails, our Brandon store has:

• Mid-length, carbine, or rifle length rails
• Free-float options for increased accuracy
• Brands like Midwest Industries, Strike Industries, and B5 Systems

5. Complete Your Lower with the Right Parts Kit

Lower parts kits include:

• Mil-spec or enhanced triggers
• Ambidextrous controls
• Upgraded grips and trigger guards

Add a buffer tube kit and your choice of Magpul, B5 Systems, or other adjustable stocks.

6. Choose a Reliable Bolt Carrier Group (BCG)

We carry full-auto rated BCGs in nickel boron and black nitride finishes from Toolcraft, Aero, and BCM—ready to drop in and run reliably.

7. Add a Charging Handle & Muzzle Device

Choose ambidextrous or extended latch charging handles and complete your barrel with a flash hider, compensator, or suppressor-ready muzzle brake.

8. Choose an Optic or Iron Sights

We stock red dots and LPVOs from Holosun, Sig Sauer, Vortex, and more. Iron sight options include Magpul MBUS sets and other back-up systems.

Why Shop Local at Gas & Brass Armory in Brandon?

• Local Expertise: We know AR-15s inside and out and guide you through your build.
• Hands-On Shopping: See and feel parts in person before you buy.
• Same-Day Service: Buy and build on the same day with in-stock parts.
• Community Focused: Serving Brandon, Riverview, Tampa, Valrico, Seffner, and surrounding areas.

Bonus: Free Gunsmithing with Your Purchase

Buy any AR-15 parts from us (minimum $50 purchase) and receive FREE installation for:

• Triggers
• Pistol grips
• Stocks and braces
• Muzzle devices
• Red dots and irons
• Handguards
• Buffer tubes and more

Visit Us in Brandon, FL

Gas & Brass Armory
607 W Robertson St, Brandon, FL 33511
Phone: (813) 934-1119
Website: www.gbaguns.com

Open 7 Days a Week – Walk-ins Welcome

Proudly serving Brandon, Riverview, Tampa, Valrico, Seffner, Lithia, and all surrounding Florida areas.

Ready to Build Your Custom AR-15?

Stop by Gas & Brass Armory today to start your custom AR-15 build with the best local support and inventory available. From stripped lowers to red dots and rail systems—we’ve got everything you need under one roof.