Front take down detent pins looks to be wrong, being looks to be too small of a pin for the channel, and not fitting the lower receiver channel correctly.

As for selector detent pin channel, should be dead center of the selector channel.


Not like this that will cause the selector to not detent lock in the correct position.


So take down pin could be the wrong pin used, or not loaded taper side outward,


While selector problem could be the selector with it detent not in the correct position (if the selector detent pin channel in the lower receiver is centered on the selector channel.

Also, some of the after market pistol grips have the selector spring channel too deep in them, and on some, have to use a piece of Q-tip shaft to shim the channel instead.  Don't over shim, since this will coil bind up the selector spring, and will not be able to move the selector with the grip has been installed.   Also, on the selector detent, should glide freely in the steep channel for it, and when pushed up with a punch during assembly, tip should be about 1/8 of the way into the selector channel.  Hence on some lowers, have to chase the channels with drill bits to clean up there ID's, and some cases, have to deepen the larger steep channel upwards more, to allow the tip of the selector detent to rise up high enough to lock into the selectors detent.

Note, selector detent is a stepped channel for a reason.  Hence should be able to push on the selector while tuning it, to remove the selector from the lower without having to remove the grip, and able to put the selector back in as well.  So if selector detent is protruding too much upwards without the selector it place, will never be able to get it back in without removing the grip.
Simply, should be able top the entire FCG in the dark by feel alone, using only the firing pin as your needed punch tool.
The reason for this, is can get a blow out primer lodged under the trigger and the only way to clear such , it to pull FCG to get it out, and get the rig back in service.