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serial number on every frame/receiver
Basic Parts and manufactured and sold in the U.S. The
Assemblies ATF also requires that a stripped (bare)
frame/receiver must be transferred to a
person who is 21 and older, who com-
pletes a background check in their state
Regardless of firearm type, action, or operation of residence.
type, or any other form of categorization, all
firearms share the same basic parts and assem- The frame/receiver features many provi-
blies. These base parts form the foundation that sions for attaching other components as
firearms are built around. Each part and assem- well as many other features to aid in func-
bly serves a specific purpose, while all working tioning. The frame/receiver may feature
together to perform one action. The following some type of trunnion or extension used
are the basic parts of any firearm. to attach the barrel. The barrel may be
screwed, pressed, and pinned or attached
• Frame/Receiver – The frame or
with a nut(s). The frame/receiver may also
receiver(s) is the central component of any
feature some type of feed ramp, used to
firearm. Almost every part of any firearm
aid in feeding. Further back, the frame/
attaches directly to the frame/receiver or
receiver will feature the breech area of the
to a part attached to the frame/receiver.
firearm. Inside the breech area, the frame
This includes the barrel, action, fire con-
may feature provisions such as rails for
trol group, controls, sights, furniture, and
the bolt/slide, ejection port, tabs, or lugs
possibly magazine(s).
for attaching a magazine.
Because the frame/receiver is such an
Still further back, the frame/receiver will
important component to any firearm, in
feature recesses and pin holes used to at-
the U.S., the frame/receiver is the part
tach the fire control group. The frame/
of the firearm that is regulated and seri-
receiver will also feature an integral or
alized. The ATF requires the manufac-
replaceable trigger guard. Typically, in
turer’s name, city and state, model, and
Figure 7: Various firearm parts.
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