Basic Performance Bundle m4 and features an integrated selector

and features an integrated selector switch that lets you quickly switch between semi- and full-auto for maximum customization

ensuring your magazine can handle drops and impacts

including black

please ensure that all safety protocols are followed during installation and use

Basic Performance Bundle m4 and features an integrated selectorBasic Performance Bundle Spring Upgrade Set + Auto Sear Spring + Trigger Spring The perfect starting point for any AAP 01 upgrade. This spring combo featuring the Spring Upgrade Set, Auto Sear Spring, and Stainless Steel Trigger Spring delivers a noticeably smoother, more consistent trigger pull right out of the box. Simple to install, immediately effective, and priced to save vs. buying separately.