Building an AR-15 rifle upper receiver involves several key parts.
Selecting the right barrel is crucial. AR-15 barrels come in various lengths and profiles to suit different needs, such as accuracy or maneuverability. They are typically made of high-quality materials like stainless steel or chrome-moly steel, ensuring durability and longevity.
AR-15 Bolt Carrier / Charge Handle
Two important components are the bolt carrier and charging handle. The bolt carrier group (BCG) consists of the bolt, carrier, gas key, and firing pin, serving as the heart of the firearm's action. It is responsible for chambering rounds, extracting spent casings, and cycling the weapon. The charging handle, located on the upper receiver, allows for the manual manipulation of the bolt carrier, facilitating actions such as chambering a round or clearing malfunctions.
AR-15 Gas Systems
The gas system plays a vital role in the firearm's operation. The gas block, typically located at the front of the barrel, regulates the flow of gas from the barrel to the gas tube. The gas tube serves as a conduit, directing the gas towards the bolt carrier group, where it cycles the action by unlocking the bolt, extracting and ejecting spent casings, and chambering new rounds.
AR-15 Hand Guards
The hand guard is an essential component that serves multiple purposes. The hand guard provides a protective covering for the barrel, shielding it from external elements and preventing contact with the shooter's hand. It also offers a platform for attaching accessories such as picatinny rails, foregrips, or sling mounts, allowing for customization and accessory integration.