What is the button on the side of an AR for?
William Brown
Updated on March 08, 2026
.
Similarly, you may ask, what does the button on the side of an m4 do?
Yes, it's the forward assist. You push it, and it forces the bolt into battery, ie, the ready to fire position. Sometimes a cartridge will not go all the way forward the first time, so hitting the forward assist will ram it home.
Similarly, what does a charging handle do on an AR? The CHARGING HANDLE is what load and cocks the rifle. In an AR15/M16/M4 - and ONLY in those - its as you correctly wrote placed on the back above the butt and buffer tube of the rifle. You pull it all the way back, release it, and the rifle if its properly maintained let the bolt move all the way forward.
Keeping this in consideration, do you need a forward assist on an AR?
As originally designed, and on purpose, the M16/AR-15 did not have an external forward assist. Stoner didn't want the M16 to have an external forward assist because he saw no need for it. To seat the bolt without a forward assist, use a finger — or thumb for left-handed shooters — of the support hand to lock it in.
How important is a forward assist on an AR 15?
The forward assist is one of the features we've come to expect on the AR-15 and its multitude of clones. If powder fouling or other matter prevented the bolt from going completely into battery, the forward assist could be used to force the round into the chamber and the bolt into its firing position.
Related Question Answers