The AR-15 lower assembly is the only part of the firearm regulated by the BATFE. It is also known as the lower half or receiver. The lower half consists of a serialized receiver, a lower parts kit, and a buttstock. It’s possible to buy a complete lower half assembled by a manufacturer or to assemble one yourself.
The lower receiver is the “firearm”. They are mostly constructed from aluminum or polymer composite. Aluminum receivers can be forged or billet. Forged is most common, where the metal is pressed into a shape with pressure. Billet starts as a solid block of aluminum stock and is carved on CNC equipment into a shape. There will always be a debate as to which one is stronger. You can choose a lower receiver based on your own personal preference. Whether it is based on brand of manufacture, finish, or material type, they all have the same function. The same receiver also can be used for different calibers. FFL needs to do a transfer, from a dealer to a person, as well as a person to person transfer. The federal government has to have record of the transfer.
The lower parts kit, LPK for short, contains the fire control group (FCG). It also contains any necessary parts, pins, and springs to make the lower receiver function.
The buttstock comes in many different forms and styles. The original A2 style is a fixed stock. The M4 stock is a collapsible or adjustable stock. Both are produced by various manufacturers and come in different shapes, sizes, and colors. AR-15 pistols do not have a stock. Any style of buttstock, even an AR pistol, requires buffer tubes. The buttstock contains parts that contribute to the function of the firearm. It contains a buffer tube, a buffer, and a buffer spring, The AR-15 pistol needs these parts as well to function properly. They also come with different mounting hardware to affix to your AR. Your personal preference plays a major role in picking the buttstock that’s right for you.
Companies that offer the following:
Forged Stripped Lower Receivers:
Armalite: $120 - $159
American Spirit Arms: $125 - $149
Bushmaster: $139 - $193.55
CMMG: $100 - $149.95
Compass Lake Engineering: $190 - $200
D S Arms: $90 - $120
Del-Ton (DTI): $80 - $120
Doublestar: $111 - $134.99
DPMS: $140 - $189.95
Fulton Armory: $120 - $129.95
GSE: $70 - $75
JP Enterprises: $175 - $195.95
LAR Manufacturing: $125 - $128
Lauer Custom Weaponry: $135 - $180
Mega Machine Shop: $130 - $138
NoDak Spud: $140 - $150
Palmetto State Amory: $79.95 - $99.95
Rock River Arms: $125 - $170
Smith and Wesson: $140 - $175
Spike's Tactical: $79 - $99
Stag Arms: $135 - $150
Superior Arms: $95 - $140
Surplus Ammo: $85 - $110
Yankee Hill Machine: $99 - $180
Lower Half Components
Lower Receiver and Buffer Tube
Fixed Buttstock Components
Note: This image is a general representation. Your Lower Parts Kit or LPK may vary.
There are many different manufactures for these components. Check out our Manufactures links page in the side menu for a complete list.