Lower Parts
Build or upgrade your rifle with quality AR-15 lower parts from Gas & Brass Armory in Brandon, FL. We offer complete lower parts kits (LPKs), individual components, upgraded triggers, buffer retainers, takedown pins, and more. Whether you’re doing a full lower build or fine-tuning your trigger and controls, we carry reliable parts from Aero Precision, CMC, Rise Armament, and other trusted brands. Everything you need to finish your lower, all in one place.
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LBE AR15 SELECTOR DETENT 20PK
LBE Unlimited
MSRP: $16.57$11.00The LBE AR15 SELECTOR DETENT 20PK from LBE Unlimited offers a reliable solution for maintaining the selector mechanism in AR-15 rifles. Manufactured from durable 12L14 steel, these detents are designed to provide consistent performance and long-lasting...MSRP: $16.57$11.00 -
KAK AR-15 LPK BASIC BUILD KIT
KAK Industry
MSRP: $34.99$25.00The KAK AR-15 LPK Basic Build Kit from KAK Industry offers a comprehensive set of lower parts necessary to assemble a functional AR-15 lower receiver. Known for their commitment to quality and American manufacturing, KAK Industry provides components that...MSRP: $34.99$25.00 -
KAK AR-15 LOWER PARTS KIT NO FCG
KAK Industry
MSRP: $44.79$32.00The KAK AR-15 Lower Parts Kit No FCG by KAK Industry offers a comprehensive set of essential components for assembling or upgrading the lower receiver of an AR-15 platform. Designed without the fire control group (FCG), this kit allows users to customize...MSRP: $44.79$32.00 -
KAK AR-15 LPK NO GRIP/TRIGGER GUARD
KAK Industry
MSRP: $62.99$45.00The KAK Industry AR-15 Lower Parts Kit (LPK) without grip and trigger guard offers a comprehensive set of essential components designed to complete the lower receiver assembly of an AR-15 rifle. Manufactured by KAK Industry, a brand known for producing...MSRP: $62.99$45.00 -
FORTIS LW ENHANCD AR15 END PLATE GLD
Fortis Manufacturing Inc.
MSRP: $53.13$38.00The Fortis Lightweight Enhanced (LW ENHANCD) AR15 End Plate in gold is engineered by Fortis Manufacturing Inc. to provide a precise and reliable fit for AR15 platforms. This end plate features a unique tapered castle nut design that ensures a secure,...MSRP: $53.13$38.00 -
FORTIS K2 ENHANCED END PLATE ODG
Fortis Manufacturing Inc.
MSRP: $59.78$43.00The Fortis K2 Enhanced End Plate in Olive Drab Green is a precision-engineered component designed by Fortis Manufacturing Inc. to enhance the stability and security of your firearmÂ’s castle nut assembly. This innovative end plate features a unique...MSRP: $59.78$43.00 -
FORTIS K1 ENHANCD AR15 END PLATE FDE
Fortis Manufacturing Inc.
MSRP: $53.13$38.00The Fortis K1 ENHANCD AR15 End Plate in Flat Dark Earth is a precision-engineered component designed by Fortis Manufacturing Inc. as part of their Lightweight Enhanced (LE) series. This end plate features an innovative tapered castle nut system that...MSRP: $53.13$38.00 -
FORTIS K1 ENHANCD AR15 END PLATE GRY
Fortis Manufacturing Inc.
MSRP: $53.13$38.00The Fortis K1 Enhanced AR15 End Plate from Fortis Manufacturing Inc. introduces a refined approach to securing the castle nut on AR15 platforms. Engineered with precision, this lightweight enhanced system features a tapered castle nut designed to seal...MSRP: $53.13$38.00 -
FORTIS K2 ENHANCD AR15 END PLATE FDE
Fortis Manufacturing Inc.
MSRP: $59.78$43.00The Fortis K2 ENHANCD AR15 End Plate in Flat Dark Earth is a precision-engineered component from Fortis Manufacturing Inc., designed to enhance the reliability of your AR-15 platform. Part of the Lightweight Enhanced series, this end plate pairs with the...MSRP: $59.78$43.00 -
FORTIS END PLATE & CASTLE NUT
Fortis Manufacturing Inc.
MSRP: $32.84$20.00The Fortis End Plate & Castle Nut combo from Fortis Manufacturing Inc. offers a high-quality, precision-engineered solution for AR-style buffer tube assemblies. Crafted from billet aircraft-grade aluminum, the castle nut provides a durable yet...MSRP: $32.84$20.00 -
FORTIS STANDARD CASTLE NUT
Fortis Manufacturing Inc.
MSRP: $18.73$12.00The Fortis Standard Castle Nut by Fortis Manufacturing Inc. is crafted from billet aircraft-grade aluminum, providing a durable yet lightweight component for your firearm assembly. Designed to fit mil-spec buffer tubes, this castle nut offers a reliable...MSRP: $18.73$12.00 -
DBST FIELD REPAIR KIT
Doublestar Corp.
MSRP: $64.39$46.00The DBST FIELD REPAIR KIT by Doublestar Corp. is a comprehensive collection of essential replacement parts tailored for semi-automatic rifles. Designed to address the most commonly worn or damaged components, this kit ensures that critical maintenance...MSRP: $64.39$46.00