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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HK UPPER MR556A4 5.56 16.5 BLK
HK
MSRP: $2,499.00$2,060.00The MR556 upper receiver kit has been updated to include all the new A4 features, including new barrel profile, adjustable gas block, handguard and more. This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style...MSRP: $2,499.00$2,060.00 -
GE URG-I NC 556NATO 14.5 BLK/DDC
Geissele Automatics
$1,479.00For more than 50 years the famed silhouette of the M16/M4 has only had one major and several minor changes. Barrel lengths and buttstocks have changed, but more or less the evolution of America's right arm has proceeded apace with each generation of...$1,479.00 -
GE SUPER DTY MOD1 5.56 13.9 URG DDC
Geissele Automatics
$1,439.00Manufactured with confidence and without compromise, the Super Duty MOD1 adds value to the platform while continuing the reputation for excellence. All of these technologies and advancements combine to bring to market a true next-gen upper for the AR-15...$1,439.00 -
GE SUPER DTY MOD1 5.56 14.5 URG DDC
Geissele Automatics
$1,439.00Manufactured with confidence and without compromise, the Super Duty MOD1 adds value to the platform while continuing the reputation for excellence. All of these technologies and advancements combine to bring to market a true next-gen upper for the AR-15...$1,439.00 -
GE SUPER DUTY MOD1 5.56 16 URG DDC
Geissele Automatics
$1,439.00Manufactured with confidence and without compromise, the Super Duty MOD1 adds value to the platform while continuing the reputation for excellence. All of these technologies and advancements combine to bring to market a true next-gen upper for the AR-15...$1,439.00 -
GE SUPER DUTY MOD1 5.56 16 URG BLK
Geissele Automatics
$1,286.00Manufactured with confidence and without compromise, the Super Duty MOD1 adds value to the platform while continuing the reputation for excellence. All of these technologies and advancements combine to bring to market a true next-gen upper for the AR-15...$1,286.00 -
FIGHT MCR MIL DF UPR 556 PIC 16.25
FightLite
MSRP: $6,999.99$6,600.00The groundbreaking MCR (Mission Configurable Rifle) belt-fed upper receiver assembly is designed to interchange with standard AR/M4 type uppers and readily fits any MIL-Spec lower receiver without permanent modification to the host lower, and is rearward...MSRP: $6,999.99$6,600.00 -
FIGHT MCR DUAL FD UPR 556 MLOK 16.25
FightLite
MSRP: $6,399.99$5,900.00The groundbreaking MCR (Mission Configurable Rifle) belt-fed upper receiver assembly is designed to interchange with standard AR/M4 type uppers and readily fits any MIL-Spec lower receiver without permanent modification to the host lower, and is rearward...MSRP: $6,399.99$5,900.00 -
FAXON ARAK-21 7.62X39 16 UPPER
Faxon Firearms
MSRP: $999.00$920.00The ARAK-21 is a gas piston actuated, complete upper receiver assembly designed to seamlessly interface with the standard AR-15 platform. The total extent of the interface is simply the take down pin, and the pivot pin. The new ARAK-21 upper receiver...MSRP: $999.00$920.00 -
DD M4A1 FSP UPR RCVR 14.5 PW 556 FDE
Daniel Defense
MSRP: $1,619.00$1,506.00This Daniel Defense M4A1 FSP AR15 style Upper Receiver Group was built for customers wanting a firearm inspired by USSOCOM SOPMOD Block II. This upper features the M4A1 FSP RIS II picatinny quad rail in Flat Dark Earth, a 14.5" M4 profile barrel,...MSRP: $1,619.00$1,506.00 -
DD M4V7 LW UPPER 556 16 MLOK BLK
Daniel Defense
MSRP: $1,300.00$1,208.00The Daniel Defense M4 V7 LW Upper Receiver Group is built around a Cold Hammer Forged 16" Lightweight profile barrel-which is two ounces less than a standard V7 barrel-and equipped with a DD improved Flash Suppressor to reduce flash signature. It...MSRP: $1,300.00$1,208.00 -
DD M4V7 UPPER 556 16 MLOK BLK
Daniel Defense
MSRP: $1,300.00$1,208.00The Daniel Defense M4 V7 Upper Receiver Group is built around a Cold Hammer Forged 16" Government profile barrel and equipped with a DD improved Flash Suppressor to reduce flash signature. It features a mid-length gas system for smooth, reliable cycling...MSRP: $1,300.00$1,208.00