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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PWS RATCHET LCK CASTLE NUT/END PLATE
Primary Weapons Systems
MSRP: $55.93$33.00The Ratchet Lock Castle Nut End Plate set works with mil-spec OR commercial buffer tubes and eliminates the need for staking. A quick upgrade to any rifle build, the Ratchet Lock Castle Nut End Plate features a QD mount and easy installation with any...MSRP: $55.93$33.00 -
SYLVAN AR FOLDING STK ADAPTER G4 RH
Sylvan Arms
MSRP: $249.19$0.00The 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$0.00Qty in Cart: 0Quantity:Price:MSRP: $249.19$0.00Subtotal: -
SYLVAN AR FOLDING STK ADAPTER G4 LH
Sylvan Arms
MSRP: $249.19$179.00The 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$179.00 -
STRIKE BILLET TRIGGER GUARD BLK
Strike Industries
MSRP: $36.33$24.00Form meets function with the Strike Industries line of Aluminum trigger guards. Not only does the sculpted, billet aluminum trigger guard make your rifle stand out from the pack, it also provides real added value over the competition. The Cobra's hood...MSRP: $36.33$24.00 -
STRIKE ENHNCD CASTLE NUT W/QD BLK
Strike Industries
MSRP: $81.13$53.00Yet another first, the Enhanced Castle Nut and Extended End Plate combo represent Strike Industries' dedication to thinking outside the box. The SI Enhanced ECN and EEP stand out from the generic parts kit units in both aesthetics and function. The steel...MSRP: $81.13$53.00 -
RISE UPPER PARTS KIT
Rise Armament
MSRP: $48.99$28.00High quality components and precise manufacturing make Rise Armament 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:...MSRP: $48.99$28.00 -
RISE OS KIT SPARE AR-15 PARTS
Rise Armament
MSRP: $26.38$16.00The parts of the OS Kit are housed in a tin with a magnetic base that keeps all the parts sorted. On the inside of the lid is a to-scale image of all the included parts so you can easily identify each spare part. From screws to pins to detents, the RISE...MSRP: $26.38$16.00 -
RADIAN ULTRALIGHT QD AR15 ENDPLATE
Radian Weapons
MSRP: $55.93$37.00Announcing the Ultralight QD Endplate for AR15/M16 pattern rifles. Weighing only 6.5 grams, the endplate is machined from billet 7075-T6 aluminum with milspec Type III anodized finish and a press-fit Titanium QD sling swivel cup. This combination of...MSRP: $55.93$37.00 -
PHASE5 SLOPED QD END PLATE BLK
Phase 5 Weapon Systems
MSRP: $62.99$40.00The Phase 5 Sloped Quick Disconnect End Plate (SQD-EP) was designed to replace the standard AR15/M4 carbine end plate. While still meeting the requirements of the original design, the SQD-EP is lighter and QD Swivel compatible. The QD mount is at a 30...MSRP: $62.99$40.00 -
MAGPUL B.A.D. LEVER BLK
Magpul Industries
MSRP: $43.82$26.00Designed to considerably improve the speed and efficiency of the AR15/M16 bolt catch, the B.A.D. Lever quickly addresses reloading and malfunction clearance shortcomings of AR15/M16 platforms by extending a paddle to the right side of the weapon,...MSRP: $43.82$26.00 -
MAGPUL ALUM ENHANCED TRIGGER GRD
Magpul Industries
MSRP: $30.52$19.00The Enhanced Trigger Guard is a black anodized aluminum drop in replacement for the AR15/M4 weapons platform. It features a shallow V shape for better use of gloves in tactical shooting or cold weather operations. The Enhanced Trigger Guard is...MSRP: $30.52$19.00 -
MAGPUL MOE ENHANCED TRIG GUARD ODG
Magpul Industries
MSRP: $15.59$10.00The MOE (Magpul Original Equipment) Enhanced Trigger Guard is a polymer drop-in replacement for the AR15 / M4 weapons platform. This upgraded trigger guard is easily installed without the use of specialized tools, using three set screws to secure it to...MSRP: $15.59$10.00