1. Lower Receiver
The lower receiver is the main component of the AR-15 and serves as the foundation of the rifle. It houses the trigger group, magazine well, and controls. Ensure you have a stripped lower receiver or a complete lower receiver assembly.
2. Upper Receiver
The upper receiver houses the bolt carrier group, barrel, and handguard. It is responsible for housing the firing mechanism and directing the projectile's path. Acquire a stripped upper receiver or a complete upper receiver assembly.
The barrel determines the rifle's caliber, length, and performance characteristics. Choose a barrel that matches your desired caliber and meets your shooting requirements, considering factors such as length, twist rate, and material.
The handguard provides a platform for accessories, protects the shooter's hand from the barrel's heat, and offers additional grip. Select a handguard that fits your preferred shooting style and accommodates any accessories you intend to mount.
5. Gas System
The gas system regulates the flow of gas from the barrel to cycle the action. Choose the appropriate gas system length (carbine, mid-length, or rifle) based on your barrel length and shooting needs.
6. Bolt Carrier Group (BCG)
The BCG houses the bolt, firing pin, and extractor, and is responsible for chambering rounds, extracting spent casings, and initiating the firing process. Ensure you have a compatible BCG for your chosen caliber and gas system.
The trigger assembly determines the rifle's trigger pull weight and overall feel. Choose a trigger that suits your shooting style, whether it's a mil-spec trigger, single-stage, or two-stage aftermarket trigger.
8. Buffer Tube and Stock
The buffer tube houses the recoil buffer and spring, while the stock provides a shoulder rest for stability and comfort. Select a buffer tube and stock that match your preferred shooting position and desired length of pull.
9. Small Parts
Various small parts, such as detents, springs, pins, and screws, are essential for securing components and ensuring proper function. Pay attention to these small parts during assembly to avoid any loose or missing components.
Consider any additional accessories you want to install, such as optics, sights, grips, or muzzle devices. Ensure you have the necessary mounting options and compatible components to attach these accessories.