Why waste time choosing each part for your AR9's lower? This lower build kit includes all the parts you need to assemble your fabricated AR9 80% lower or retail-bought 9mm stripped lower.
Note: Due to ATF rule 2021R-08F, any pistol with a stabilizing brace is considered a short-barreled rifle (SBR), and is therefore considered a National Firearms Act item requiring a federal tax stamp.
AR9 Lower Build Kit: What's Included
Fire Control Group
- AR-15 Hammer
- Hammer Spring
- AR-15 Trigger
- Trigger Spring
- Trigger/Hammer Pins
- Disconnector
- Disconnector Spring
Buffer Tube Assembly
- Buffer Tube
- Buffer
- Buffer Spring
- Castle Nut
- Latch Plate
- Buffer Retainer Detent
- Buffer Retainer Detent Spring
Takedown & Pivot Pins
- Takedown Pin
- Pivot Pin
- Takedown Springs (3)
- Takedown Detents (3)
Bolt Catch Assembly
- Bolt Catch
- Bolt Catch Detent
- Bolt Catch Detent Spring
- Bolt Catch Roll Pin
Safety Lever Assembly
- Safety Selector
- Selector Detent
- Selector Spring
Installation Instructions
Follow our step-by-step picture and video guide to install your AR9 Lower Build Kit. You'll also need some basic tools, like an Armorer's Wrench, and Roll Pin Punches with a Gunsmithing Hammer.
Guide: How to install the AR lower parts kit.
Completing Your AR9 Build
Make finishing your AR9 pistol even easier! Check out our available 9mm barreled uppers.
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily.
80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
