Controls and safety-system terminology
Distinguish the magazine release, bolt catch, selector, trigger guard, and fire-control group.
Controls do different jobs
The magazine release relates to magazine retention. The bolt catch relates to holding the bolt assembly open. The safety selector is part of the safety system. The trigger guard is the surrounding guard, not the trigger mechanism. The book covers these parts separately because the names and functions differ.
OPEN FULL SIZE ↗A source close-up showing the receiver, grip, trigger guard, and visible controls.
Source image: Real Avid, Top AR15 Mods, ©2021. PDF page 52.
OPEN FULL SIZE ↗Labeled source illustration of upper and lower receivers, rear support components, and controls.
Source image: Real Avid, Top AR15 Mods, ©2021. PDF page 4.Appearance does not establish safety
Descriptions such as extended, ambidextrous, enhanced, or drop-in are product descriptions. They are not assurances that a component is appropriate for a particular firearm or that changing it leaves the safety system functioning correctly.
Internal work has a different boundary
The book's trigger, selector, and retention-pin chapters involve internal components. This public guide retains vocabulary and the need for qualified assessment, while leaving replacement sequences, fitting, adjustment, and performance changes out of the reference.
Know the control's name and role. Suspected safety-system problems require qualified inspection before further use.