Building your own AR-15 can be a rewarding experience, offering customization and a deeper understanding of your firearm. A crucial component of this process is the lower parts kit (LPK). This comprehensive guide will delve into everything you need to know about complete lower parts kits, helping you choose the right one for your build.
What is a Complete Lower Parts Kit?
A complete lower parts kit contains all the essential components needed to assemble the lower receiver of an AR-15. The lower receiver is the serialized part of the firearm, making it the regulated component. The LPK itself doesn't include the lower receiver; you'll need to purchase that separately. Think of the LPK as the internal mechanics that bring the lower receiver to life.
This kit typically includes:
- Trigger: The mechanism that fires the weapon. Different triggers offer varying levels of pull weight and feel.
- Hammer: Strikes the firing pin, igniting the primer.
- Disconnector: Prevents the weapon from firing automatically.
- Firing Pin Retainer Pin: Securely holds the firing pin in place.
- Firing Pin: The component that strikes the primer in the cartridge.
- Bolt Catch: Locks the bolt to the rear after the last round is fired.
- Bolt Catch Roller Pin: A small pin that aids the function of the bolt catch.
- Magazine Catch: Releases the magazine from the lower receiver.
- Magazine Catch Button: The button pressed to release the magazine.
- Hammer Pin: Pins the hammer to the lower receiver.
- Trigger Pin: Pins the trigger to the lower receiver.
- Grip Screw: Securely fastens the pistol grip to the lower receiver.
- Pistol Grip Screw: This can sometimes be included separately.
- Buffer Retainer Pin: Retains the buffer tube.
Note: Some LPKs may include additional components or variations depending on the manufacturer. Always double-check the included parts before purchasing.
Choosing the Right Complete Lower Parts Kit
The market offers a wide array of complete lower parts kits, ranging from budget-friendly options to high-end, enhanced kits. Consider these factors when making your selection:
Budget:
LPKs are available across a wide price range. While cheaper options might be tempting, investing in a reputable brand with quality materials can prevent potential malfunctions and ensure the longevity of your firearm.
Material:
Most LPKs are made from steel, but some components might be made of aluminum or other materials. Steel is generally preferred for its durability. Look for kits that specify the materials used for each component.
Brand Reputation:
Research different manufacturers before making a purchase. Read reviews from other builders to gauge the quality and reliability of their LPKs. Choosing a reputable brand will give you peace of mind.
Features:
Some LPKs may include enhanced features like drop-in triggers or upgraded components for improved performance. Consider your needs and preferences when selecting a kit with specific features.
Installation and Considerations
Installing a complete lower parts kit requires careful attention to detail and proper tools. Numerous online resources offer detailed instructions and video tutorials, but it's crucial to thoroughly understand the process before beginning. If you're unsure about any aspect of the installation, seek the assistance of an experienced gunsmith. Improper installation can lead to malfunctions and potentially dangerous situations.
Always remember to follow all local, state, and federal laws regarding firearms ownership and assembly.
Conclusion
Selecting the right complete lower parts kit is an essential step in building your AR-15. By carefully considering your budget, material preferences, and the brand's reputation, you can ensure a smooth and successful build. Remember, safety and proper installation are paramount. Enjoy the process and the satisfaction of building your own AR-15!
