The complete upper should have also rear and front sight assembly, gas tube, flash hider, and Delta ring. Other essential parts of the upper receiver are charging handle, ejection port cover, and forward assist. Handguards or forends will depend on what length gas system you chose on your barrel. The proper gas system length will provide moderate recoil and smoother cycling. When you select the barrel length, it should match with the appropriate gas block/gas system.
The bolt carrier group includes major components like a carrier, bolt with extractor, gas key, firing pin, and cam pin.Īnother key element to your AR-15 is the barrel. First off, “full-auto” BCGs are legal, and secondly, these slightly longer and heavier bolt carrier groups have some extra weight which may help your AR-15 to cycle more smoothly. There are two types of bolt carrier groups known as M16 full-auto bolt carrier groups and AR-15 semi-auto BCG’s. You can choose between stripped upper receivers or complete upper assemblies, but the latter would work better if you are a first-time AR-15 buyer.Īlong with other components, the complete upper holds the “heart and soul” “of your M16A1 - the BCG (Bolt Carrier Group) and barrel.
The M16A1 upper receiver (often simply referred to as an “upper”) keeps and protects many of the most critical parts on your AR rifle. In the following section, we will briefly describe the most important parts and their function. While the receivers may come in a tremendous amount of different variations and can be made from various metals or even polymers, the aluminum is by far the most common material. Well-known for its straightforward design, the AR-15 roughly consists of two basic entities known as the upper and lower receiver and they can be purchased in various forms and configurations. Shortly afterward, the firearm industry turned out to the civilian sector and flooded the market with numerous AR style rifles and accessories for them.A note to readers: as mentioned, the M16A1 originally is the first variant issued to the Army during the Vietnam War, but today many writers use this term in the same connotation as the semi-auto AR-15. The AR-15 has gone through several production variants (A1, A2, A3, and A4) since the original model, to be transformed in the 1980s into a new short barreled platform, known as the M4 Carbine. Army and stayed over 50 years in active service, more than any other long barreled weapon. However, through the interactive cooperation with troops at the field and constant development in project bureaus, the AR-15/M16 rifle became standard equipment for the U.S. As most of our readers know, the early AR-15 models have some issues. Along with AK47, the M16 is genuinely a cult sample of the world arms industry and legendary firearm which should find its place in the gun safes of every gun aficionado.
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