Slowly loosen the grip because there safety and take down dents and springs are held captive by the grip. So they could go flying across the room never to been seen again or until you step on it. AR15 grips will only have one hole for the safety spring because on the AR15 the take down pin and dent is held captive by the receiver extension end plate and not in the grip.
Brett248Vista has made some great instructional videos, check out this thread.