A1Armory 31 piece Lower Parts Kit

A1Armory AR-15 Lower Parts Kit

Upgrade your AR-15 build with confidence using the A1Armory AR-15 31-Piece Lower Parts Kit — a complete, precision-machined solution for builders and enthusiasts who demand performance, reliability, and seamless assembly. Whether you're starting a new build or refreshing an existing lower receiver, this kit includes everything you need to get the job done right.

? Compatible with all standard mil-spec AR-15 lower receivers

? Ideal for new builds or replacement of worn components

? Machined to exacting specifications for flawless fit & function

✅ What's Included – 31 Precision Components

Bolt Catch Assembly

✅ Bolt Catch
✅ Bolt Catch Plunger
✅ Bolt Catch Roll Pin
✅ Bolt Catch Spring

Buffer Retainer Group

✅ Buffer Retainer Pin
✅ Buffer Retainer Spring

Detent Springs & Pins

✅ 2x Detent Springs
✅ Pivot Pin Detent
✅ Take Down Pin Detent

Fire Control Group

✅ Hammer
✅ Hammer Pin
✅ Hammer Spring
✅ Trigger
✅ Trigger Pin
✅ Trigger Spring
✅ Disconnector
✅ Disconnector Spring

Magazine Catch Assembly

✅ Magazine Catch
✅ Magazine Catch Button
✅ Magazine Catch Spring

Pistol Grip Assembly

✅ Pistol Grip
✅ Pistol Grip Screw
✅ Pistol Grip Lock Washer

Selector & Safety Group

✅ Selector
✅ Selector Spring
✅ Safety Detent

Take Down & Pivot Pins

✅ Pivot Pin
✅ Take Down Pin

Trigger Guard Assembly

✅ Trigger Guard
✅ Trigger Guard Roll Pin

Why Choose the A1Armory Lower Parts Kit?

✅ Mil-Spec Compatibility – Works with any standard AR-15 lower
✅ Full 31-Piece Kit – No missing parts, no surprises
✅ DIY & Pro-Friendly – Ideal for beginners and seasoned builders alike
✅ Quality-Controlled – All components inspected for reliability & fit
✅ Enhanced Performance – Smooth trigger pull, solid safety engagement, and dependable mag retention

Pro Tip: Pair this LPK with an A1Armory buffer tube kit and stock assembly for a complete lower build solution.

Built for Builders Who Refuse to Compromise

At A1Armory, we stand behind every part we sell. This AR-15 Lower Parts Kit delivers the precision, durability, and ease of installation that sets serious builds apart. Perfect for your next project, this kit makes assembling your lower receiver fast, simple, and rock-solid reliable.