Gun Nuts® Sporter Lower Parts Kit

Features notched hammer and precision-fit components.
Want to upgrade an old AR-15 with modern performance? The Sporter Lower Parts Kit from Gun Nuts does just that.
This LPK features a notched hammer for compatibility with unshrounded bolt carrier groups found in old Colt, Bushmaster, and surplus uppers, while also providing precision-machined components to guarantee reliable cycling and accuracy.
Sporter Lower Parts Kit: What’s Included

Hammer
Pistol Grip
Trigger
Pivot Pin
Pivot Pin Detent
Pivot Pin Detent Spring
Takedown Pin
Takedown Pin Detent
Takedown Pin Detent Spring
Bolt Catch
Bolt Catch Plunger
Bolt Catch Roll Pin
Bolt Catch Spring
Buffer Retainer
Buffer Retainer Spring
Hammer Pin
Hammer Spring
Trigger Pin
Trigger Spring
Disconnect
Disconnect Spring
Magazine Catch
Magazine Catch Spring
Magazine Release Button
Trigger Guard
Trigger Guard Roll Pin
Ambi Safety Selector
Selector Detent
Selector Detent Spring
Pistol Grip Lock Washer
Pistol Grip Screw

Installation Instructions
Follow our step-by-step instructions to install your Sporter Lower Parts Kit!

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 Restrictions
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.

GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.