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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ADV TECH AR15 CASTLE NUT
ATI Outdoors
MSRP: $12.47$8.00High quality components and precise manufacturing make Advance Tech parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.MANUFACTURER: ATI...MSRP: $12.47$8.00 -
ADV TECH AR15 GRIP SCREW/WASHER
ATI Outdoors
MSRP: $4.64$3.00This grip screw set can be used for a new build or as a replacement for that frustrating OEM flat head screw. It comes with a steel 1/4-28 x 1" Hex bolt and a steel star washer.MANUFACTURER: ATI OutdoorsMPN: A.5.10.2548MODEL: 0Description: AR Pistol Grip...MSRP: $4.64$3.00 -
ADV TECH LOP QUICK STOP
ATI Outdoors
MSRP: $22.51$12.00High quality components and precise manufacturing make Advance Tech parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.MANUFACTURER: ATI...MSRP: $22.51$12.00 -
Out of stock
NOVESKE QUICK DETACH END PLATE BLK
Noveske
MSRP: $41.64$31.00Carbine Receiver End Plate with QD Sling Swivel Attachment made by Noveske.MANUFACTURER: NoveskeMPN: 05000094MODEL: Quick Detach MountDescription: Quick DetachType: MountColor: BlackMSRP: $41.64$31.00 -
Out of stock
SYLVAN AR FOLDING STK ADAPTER G4 LH
Sylvan Arms
MSRP: $249.19$178.00The Folding Stock Adapter allows you to fold your stock and significantly reduce the length of your rifle for easy stow and travel. The Gen 4 AR Folding Adapter sits closer to your AR lower to reduce the length and any gaps. Turn your rifle into a...MSRP: $249.19$178.00 -
Out of stock
SEEKINS BILLET AR TRIGGER GUARD BLK
Seekins Precision
MSRP: $33.60$24.00The Seekins Precision Billet Trigger Guard is a functional upgrade for any Mil-Spec lower receiver. Machined from a solid piece of 6061-T6, the profile and size accommodate winter gloves while maintaining precise trigger control.MANUFACTURER: Seekins...MSRP: $33.60$24.00 -
Out of stock
LANTAC RPS END PLATE & CASTLE NUT
LanTac USA LLC
MSRP: $76.99$55.00High quality components and precise manufacturing make Lantac parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.MANUFACTURER: LanTac...MSRP: $76.99$55.00 -
Out of stock
KAK AR-15 LOWER PARTS KIT NO FCG
KAK Industry
MSRP: $44.79$32.00KAK Industry was founded and incorporated in 2011 by Kurt Kosman to address a gap in the firearms market for quality, American-Made components at affordable, sustainable prices.MANUFACTURER: KAK IndustryMPN: 506-1015-009MODEL: AR-15 Lower Parts...MSRP: $44.79$32.00 -
Out of stock
KAK AR-15 LPK NO GRIP/TRIGGER GUARD
KAK Industry
MSRP: $62.99$45.00KAK Industry was founded and incorporated in 2011 by Kurt Kosman to address a gap in the firearms market for quality, American-Made components at affordable, sustainable prices.MANUFACTURER: KAK IndustryMPN: 506-1015-008MODEL: AR-15 Lower Parts...MSRP: $62.99$45.00 -
Out of stock
KAK AR-15 LOWER PARTS KIT COMPLETE
KAK Industry
MSRP: $71.39$51.00KAK Industry was founded and incorporated in 2011 by Kurt Kosman to address a gap in the firearms market for quality, American-Made components at affordable, sustainable prices.MANUFACTURER: KAK IndustryMPN: 506-1015-007MODEL: AR-15 Lower Parts...MSRP: $71.39$51.00 -
Out of stock
FORTIS K2 ENHANCD AR15 END PLATE BLK
Fortis Manufacturing Inc.
MSRP: $59.78$43.00When designing their new Lightweight Enhanced (LE) Castle Nut & End Plate System, Fortis came up with two systems that virtually eliminates the risk of your castle nut ever backing out. With two lockdown systems (K1 & K2), Fortis has engineered a...MSRP: $59.78$43.00 -
Out of stock
FORTIS LW ENHANCD AR15 END PLATE BLK
Fortis Manufacturing Inc.
MSRP: $53.13$38.00The K1 system features a tapered castle nut that seals itself onto the end plate. This ultra precision snug fit allows the castle nut to seat and seal itself into place without the need of staking the end plate. No ratcheting, no set screws, no backing...MSRP: $53.13$38.00