Finding the right lower receiver parts kit is crucial for building your AR-15. This comprehensive guide will walk you through everything you need to know, from understanding the components to selecting the best kit for your needs. We'll cover common parts, factors to consider when choosing a kit, and best practices for assembly.
Understanding the Lower Receiver Parts Kit
The lower receiver is the heart of your AR-15, housing the fire control group and acting as the foundation for the entire firearm. A lower receiver parts kit (LPK) contains all the necessary components to complete your lower receiver, excluding the receiver itself. These kits are available in various configurations, offering different levels of quality and features.
Key Components Included in Most LPKs:
- Hammer: Strikes the firing pin, igniting the primer.
- Hammer Pin: Securely holds the hammer in place.
- Disconnector: Prevents the gun from firing automatically.
- Trigger: Initiates the firing sequence when pressed.
- Trigger Pin: Holds the trigger and disconnector in place.
- Firing Pin Retaining Pin: Secures the firing pin.
- Firing Pin: Ignites the primer in the cartridge.
- Bolt Catch: Locks the bolt to the rear when the magazine is empty.
- Bolt Catch Roll Pin: Secures the bolt catch.
- Magazine Catch: Releases the magazine from the lower receiver.
- Magazine Catch Button: The button you press to release the magazine.
- Safety Selector: Controls whether the firearm can fire.
- Safety Selector Detent: Holds the safety selector in place.
- Safety Selector Spring: Returns the safety selector to its neutral position.
- Grip Screw: Secures the pistol grip to the lower receiver.
Factors to Consider When Choosing a Lower Receiver Parts Kit
Choosing the right LPK involves considering several key factors:
1. Material Quality:
The materials used significantly impact the kit's durability and reliability. Look for kits made from high-quality materials like hardened steel and durable polymers. Cheap materials can lead to malfunctions and premature wear.
2. Manufacturer Reputation:
Opt for reputable manufacturers with a proven track record of producing reliable and high-quality parts. Researching reviews and seeking recommendations from experienced builders can be beneficial.
3. Budget:
LPKs are available at various price points. While it's tempting to go for the cheapest option, investing in a higher-quality kit can save you money in the long run by preventing malfunctions and reducing the need for replacements.
4. Specific Needs:
Consider your specific requirements. Some kits might include enhanced features like ambidextrous safety selectors or upgraded triggers. Determine which features are essential for your build and select a kit that meets those needs.
Assembling Your Lower Receiver Parts Kit
Once you've chosen your LPK, the next step is assembly. While numerous resources are available online detailing the process, it's strongly recommended to seek guidance from experienced builders or watch detailed instructional videos before attempting assembly. Improper assembly can lead to malfunctions or even damage to the firearm. Safety should always be your top priority.
Conclusion
Selecting and assembling a lower receiver parts kit is a crucial step in building your AR-15. By carefully considering the factors discussed above and taking your time during the assembly process, you can ensure a reliable and functional firearm. Always prioritize safety and seek expert advice if needed. Remember to always comply with all applicable federal, state, and local laws and regulations.
