As such, you are able to maintain more on-target shots. Compensators come in handy in countering muzzle climb in case you are firing rapidly. The muzzle group has devices like compensators, flash hiders, and muzzle brakes. The bolt carrier group works to load the gun, fire bullets the right way, and extract used shells out of the chamber. The gas key, firing pin, cam pin, and extractor also come in this section. The bolt carrier group comprises the bolt carrier with key and key screw, bolt catch with pin, spring, and plunger, and the bolt ring. They stand for "Armalite Rifle" because the original maker was known as ArmaLite, Inc before they sold the design in 1959 to Colt. Note that the letters "AR" do not stand for "automatic or assault rifle". To have a clear understanding of the AR-15, please refer to the picture below. The condensed approach counts several related parts as a batch, while the expanded approach counts every single part on its own. If the pin on the rearmost side is pushed out, the upper receiver tilts forward to allow for field cleaning.ĭepending on the mode of counting the parts of the AR-15, the number will be 100 using a condensed counting approach, and 140 using the expanded approach. When the two pins are both pushed out, the parts are separated. The two parts are held together by two pins. The original Armalite AR-15 have the charging handle located on top of the upper receiver, protected within the carrying handle.Ĭolt M16 rifle based weapons Colt model no.What Are the Parts Of an AR-15 and How Many Parts In an AR-15?Īn AR-15 consists of two main sections: the upper receiver parts, and the lower receiver parts.
COLT AR 15 LOWER CODE
Military/LE models are also easily identified by their three digit code in contrast to the four digit codes for civilian weapons. For the purposes of this table, the RO nomenclature is obviated as this terminology did not exist in all cases, but it can be understood to be present. Colt’s systems have generally followed the times and though its model numbers originally came without prefixes, with the need to separate weapons made for civilian consumption from those made for military and law enforcement use, military models became prefixed with the code "RO". Colt has an intricate internal nomenclature system for its models, with a variety of suffixes and prefixes.