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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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 -
DBST OOPS! REPLACEMENT KIT
Doublestar Corp.
MSRP: $24.73$15.00The DBST OOPS! Replacement Kit by Doublestar Corp. is designed to keep your firearm operational by providing essential commonly lost or worn parts in one convenient package. This comprehensive kit includes a variety of springs, detents, pins, and other...MSRP: $24.73$15.00 -
COLT LOWER RECEIVER PARTS KIT AR15
Colt
MSRP: $152.95$110.00The Colt Lower Receiver Parts Kit AR15 offers a comprehensive selection of genuine Colt factory components designed specifically for the AR-15 platform. This kit provides all essential small parts needed to complete a small-pin lower receiver, allowing...MSRP: $152.95$110.00 -
COLT FIELD REPAIR KIT M4/AR15
Colt
MSRP: $54.74$40.00The Colt Field Repair Kit M4/AR15 is a comprehensive solution designed to maintain the operational integrity of your rifle. Crafted by Colt, a trusted name in firearms manufacturing, this kit includes an assortment of mil-spec replacement parts tailored...MSRP: $54.74$40.00 -
COLT HIGH WEAR PARTS KIT M4/AR15
Colt
MSRP: $37.24$27.00The Colt High Wear Parts Kit for M4/AR15 rifles is designed to provide essential replacement components for maintaining the reliability and functionality of your firearm. Manufactured by Colt, a trusted name in the industry, this kit includes...MSRP: $37.24$27.00 -
Out of stock
COLT BOLT REPAIR KIT M4/AR15
Colt
MSRP: $32.34$20.00The Colt Bolt Repair Kit for M4/AR15 rifles offers a reliable solution for maintaining and restoring the bolt assembly of your firearm. Designed by Colt, a trusted name in firearm manufacturing, this kit provides essential components to address wear and...MSRP: $32.34$20.00 -
CMMG PARTS KIT AR15 MAGAZINE CATCH
CMMG
MSRP: $18.78$12.00The CMMG Parts Kit AR15 Magazine Catch is engineered to deliver reliable performance and precise fitment for AR15 platform rifles. Manufactured by CMMG, a trusted name in firearm components, this magazine catch is crafted with attention to detail to...MSRP: $18.78$12.00 -
CMMG PARTS KIT AR15 BOLT CATCH
CMMG
MSRP: $17.33$11.00The CMMG Parts Kit AR15 Bolt Catch is a precision-engineered component designed to enhance the functionality and maintenance of AR-15 platforms. Manufactured by CMMG, a trusted name in firearm parts, this bolt catch is crafted with high-quality materials...MSRP: $17.33$11.00