AR15 Parts
Gas & Brass Armory is your trusted source for AR-15 parts in Brandon, FL. Whether you're upgrading your current rifle or building a custom AR from the ground up, we stock high-quality components from top manufacturers like Aero Precision, Magpul, Radian Weapons, BCM, Geissele, and more. Shop complete uppers, stripped lowers, triggers, handguards, buffer kits, barrels, and everything you need for your next AR build. Our expert staff is here to help you build it right the first time.
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DD MK18 URG UPPER 556 10.3 MK18 BLK
Daniel Defense
MSRP: $1,595.56$1,412.00Use what THEY use. The Daniel Defense MK18 Upper Receiver Group features the railed forend Daniel Defense currently provides to USSOCOM and a 10.3" Cold Hammer Forged Barrel. The MK18 Rail Interface System (RIS II) features the Bolt-Up System has been...MSRP: $1,595.56$1,412.00 -
COLT EPR UPPER KIT 5.56 14.5 BLK
Colt's Manufacturing
MSRP: $1,181.25$1,045.35High quality components and precise manufacturing makes Colt Products ideal for both new shooters and experienced gun owners. The durability, reliability and excellent build quality will provide years of service you can count on.MANUFACTURER: Colt's...MSRP: $1,181.25$1,045.35 -
CMMG BBL BCG KIT 8 9MM 4140CM SBN
CMMG
MSRP: $503.19$402.55CMMG IS A LEADING MANUFACTURER OF AR-15 RIFLES, 22LR AR-15 CONVERSION KITS AND ACCESSORIES.MANUFACTURER: CMMGMPN: 99D517AMODEL: MKGSBarrel Length: 8"Fit: AR RiflesCaliber: 9MMType: BarrelColor: BlackMSRP: $503.19$402.55 -
CMMG BBL BCG KIT 5 9MM 4140CM SBN
CMMG
MSRP: $476.69$381.35The CMMG 5" 9MM MkGs Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using their patent-pending Radial Delayed Blowback System. Unlike typical direct blowback systems, their RDB uses a bolt that rotates and unlocks, slowing the BCG. This...MSRP: $476.69$381.35 -
Out of stock
CMMG BBL 5.7X28 10.4 PS90
CMMG
MSRP: $308.86$247.09Great choice for your PS90 SBR project. Pair this with a CMMG PS90 Flash hider or thread adapter to complete your SBR.MANUFACTURER: CMMGMPN: 57DF1C7MODEL: 0Type of Barrel: 01:09:00Barrel Length: 10.4"Fit: FN PS90Caliber: 5.7X28MMType: BarrelColor: BlackMSRP: $308.86$247.09 -
CMMG BBL 300BLK 8 4140CM SBN
CMMG
MSRP: $198.28$141.50Perfect for building your custom AR15 upper group. Comes with properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. ALL NFA RULES APPLYMANUFACTURER: CMMGMPN: 30D810AMODEL: 0Barrel Length: 8"Description: 4140CMFinish:...MSRP: $198.28$141.50 -
CMMG UPPR DSNT 5.7X28MM 6.5 CG
CMMG
MSRP: $1,169.54$1,034.99The 5.7x28mm personal defense cartridge has found home with the purposefully designed 6.5" DISSENT upper group, all you need is a Mk4/mil-spec AR15 lower receiver or CMMG Mk57 lower receiver. All DISSENT uppers include a lower receiver 1913 picatinny...MSRP: $1,169.54$1,034.99 -
CMMG BBL AND BCG KIT 8 5.7X28MM
CMMG
MSRP: $482.99$386.39The 8" 5.7x28mm Barrel and BCG Kit is perfect for building an AR pistol or SBR in 5.7x28mm using CMMG's patented Radial Delayed Blowback operating system. Unlike typical direct blowback systems, Radial Delayed Blowback not only reduces the weight in your...MSRP: $482.99$386.39 -
CMMG BBL AND BCG KIT 5 5.7X28MM
CMMG
MSRP: $476.69$381.35The 5" 5.7x28mm Barrel and BCG Kit is perfect for building an AR pistol or SBR in 5.7x28mm using CMMG's patented Radial Delayed Blowback operating system. Unlike typical direct blowback systems, Radial Delayed Blowback not only reduces the weight in your...MSRP: $476.69$381.35 -
BAD 10.5 UPPR WRKHORSE 556 AMBI GRAY
Battle Arms Development
MSRP: $816.48$709.98The WORKHORSE complete upper receiver is purpose-built around the forged WORKHORSE 7075-T6 aircraft-grade aluminum receiver and free-float rail handguard with M-LOK attachment point at 3, 6, and 9 o'clock positions. At 12 o'clock is a full-length...MSRP: $816.48$709.98 -
Out of stock
BAD 10.5 UPR WRKHORSE 556AMBI C BLK
Battle Arms Development
MSRP: $758.98$659.98The WORKHORSE complete upper receiver is purpose-built around the forged WORKHORSE 7075-T6 aircraft-grade aluminum receiver and free-float rail handguard with M-LOK attachment point at 3, 6, and 9 o'clock positions. At 12 o'clock is a full-length...MSRP: $758.98$659.98 -
BAD 10.5 UPPR WRKHORSE 556 AMBI BLK
Battle Arms Development
MSRP: $758.98$659.98The WORKHORSE complete upper receiver is purpose-built around the forged WORKHORSE 7075-T6 aircraft-grade aluminum receiver and free-float rail handguard with M-LOK attachment point at 3, 6, and 9 o'clock positions. At 12 o'clock is a full-length...MSRP: $758.98$659.98