Lower Parts

1394 products · page 1 of 47

Lower parts are the small pieces that make a stripped lower work: the magazine catch, bolt catch, pivot and takedown pins, safety selector, trigger guard, and their springs and detents. Most builders buy them together as an AR-15 lower parts kit (LPK); single parts are handy for replacing a lost detent or upgrading to an ambidextrous safety or an extended magazine release.

Kits are sold with or without a trigger group and grip, so check what's included before you compare prices. Mil-spec lower parts interchange across brands.

Read our guide: How to Build an AR-15: Parts List, Tools & Steps

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Product	Type	Color	Platform	Material	Best price
Strike Industries AR-15 Enhanced Lower Receiver Parts Less Trigger, Hammer and DisconnectorStrike IndustriesAR-15	—	—	AR-15	—	$49.995 storesIn stock
CMC TRIGGER AR15 LPK WITHOUT GRIP/FIRE CONTROLCMC TriggersAR-15	—	—	AR-15	—	$35.993 storesIn stock
CMC Trigger Single Stage Flat 3.5lbs with Lower Parts KitCMC Triggers	—	—	—	—	$159.995 storesIn stockSale
AR-15 Lower Pin & Spring KitCMMGAR-15	—	—	AR-15	—	$12.498 storesIn stock
Bcmgunfighter AR-15 Enhanced Lower Parts Kit, BLKBravo Company MFGBlack · AR-15	—	Black	AR-15	—	$119.955 storesIn stock
Lower Parts Kit AR-15CMMGAR-15	—	—	AR-15	—	$56.998 storesIn stock
Armaspec Anti-Walk Trigger/Hammer Pins ‒ ARM136-SSArmaspec	—	—	—	—	$10.797 storesIn stock
Armaspec Gun Builder's Lower Parts Kit - BlackArmaspecBlack	—	Black	—	—	$67.493 storesIn stock
Lower Receiver Gunsmith Spring KitStrike IndustriesAR-15	—	—	AR-15	—	$95.953 storesIn stockSale
AR-15 Mil-Spec Lower Parts Kit W/ Grip, No TriggerGeissele AutomaticsAR-15	—	—	AR-15	—	$68.003 storesIn stock
AR-15 Lower Parts KitLuth-ARAR-15	—	—	AR-15	—	$55.924 storesIn stock
AR-15 Builder Kit, Less Fire Control Group & Grip PartsLuth-ARAR-15	—	—	AR-15	—	$38.993 storesIn stock
Lower Parts Kit With Trigger Single Stage Curved 3 LbCMC TriggersAR-15	—	—	AR-15	—	$159.994 storesIn stockSale
AR-15 Ultra Duty Lower Parts Kit BlackGeissele AutomaticsBlack · AR-15	—	Black	AR-15	—	$153.005 storesIn stock
Gun Builders Stainless Lower Parts Kit .223/5.56 BlackArmaspecBlack · AR-15	—	Black	AR-15	—	$67.494 storesIn stock
Stainless Lower Parts Kit .223/5.56 BlackArmaspecBlack · AR-15	—	Black	AR-15	—	$71.993 storesIn stock
22 ARC Spring KitCMMGKit · AR-15	Kit	—	AR-15	—	$12.316 storesIn stock
308 AR Gunbuilder's Lower Parts KitCMMGKit · AR-10	Kit	—	AR-10	—	$39.998 storesIn stock
V2 Ebrv2/308 Extended Bolt ReleasePhase 5 TacticalAR-10	—	—	AR-10	—	$59.996 storesIn stock
Ambidextrous Modular Safety-BlackOdin WorksSafety · Black · AR-15	Safety	Black	AR-15	—	$46.997 storesIn stock
AR .308 Enhanced Magazine Release Button DimpledForward Controls DesignMagazine Catch · AR-10	Magazine Catch	—	AR-10	—	$16.155 storesIn stock
AR .308 Enhanced Magazine Release Button SerratedForward Controls DesignMagazine Catch · AR-10	Magazine Catch	—	AR-10	—	$16.155 storesIn stock
AR .308 Titanium Take Down Pin SetNemoAR-10 · Titanium	—	—	AR-10	Titanium	$42.751 storeIn stock
AR 308 Enhanced Cast Bolt Catch Black PhosphateBattle Arms DevelopmentBlack · AR-10	—	Black	AR-10	—	$16.956 storesIn stock
AR Enhanced Lower Receiver Parts Kit With TriggerStrike IndustriesKit · AR-15	Kit	—	AR-15	—	$75.957 storesIn stock
ESK Esl Safety Selector Ambidextrous For AR-15 BlackMagpulSafety · Black · AR-15 · Steel	Safety	Black	AR-15	Steel	$40.998 storesIn stock
ESK Esl Safety Selector Ambidextrous For AR-15 FDEMagpulSafety · Flat Dark Earth · AR-15 · Steel	Safety	Flat Dark Earth	AR-15	Steel	$46.757 storesIn stockSale
AR Wedge 3 Pack OrangeErgo GripsAR-15	—	—	AR-15	—	$9.295 storesIn stock
AR-15 .22lr V1 Catch22 Bolt CatchAR Catch22AR-15	—	—	AR-15	—	$24.991 storeIn stock
AR-15 .22lr S&W M&P 15-22 Clip-On Magazine AdapterAR Catch22AR-15	—	—	AR-15	—	$7.991 storeIn stock

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Lower Parts: common questions

What comes in an AR-15 lower parts kit?

Usually the magazine catch and button, bolt catch, pivot and takedown pins with their detents and springs, the safety selector, the trigger guard, and the hammer, trigger and disconnector. Some kits leave out the trigger group or the grip so you can pick your own.

Do I need special tools to install lower parts?

Roll pin punches, a small hammer and a lower vise block make it much easier, and a pivot pin tool (or a 1/4-inch clevis pin) saves a lot of frustration. Our Ultimate AR-15 Build Guide walks through each step with photos.

Are lower parts interchangeable between brands?

Yes, mil-spec AR-15 lower parts share the same dimensions and swap between brands. Billet lowers with built-in or ambidextrous features may need their maker's own parts.