When you refer to pistol grips you are referring to the portions of pistols which are held in the hand. These grips allow the pistol to be gripped so your pistol is held in a forward position enabling the MPX submachine gun line pistols to be also held properly oriented in the vertical axis also.
A pistol grip is also so designed, so your hand that grips the pistol is also in a position to operate the trigger at the same time. A pistol grip also serves at times within the storage for magazines or other tools. It can also be a part of the mechanism that facilitates the charging of the pistol. When the pistol grip is held in the hand between the palm and the finger, the forefinger is in a position to pull the trigger, whereas the thumb is clear to push out a the safety catch, and not move the palm or other finger.
Pistol grips are made from wood, plastic and other composite materials. The size of a pistol grip will change depending on the size of the hand, length of the finger and other comfort factors. When a pistol or handgun is arranged with bone of the forearm then the recoil from the pistol is absorbed. The pistol grips active must allow such angle to be achieved easily and without any problem. The hand holding the pistol grip needs to be as towards the bore of the pistol so your recoil felt is less and also allows recovery between shots. Good shooting practice also requires the supporting hand to be held under the trigger, with the finger parallel to the shooting hand.
Pistol grips are the only part of any handgun that can be customized and changed to very personal attachments. Just changing the design and the color of the hand grip allows you to give any pistol a very personal look that is unique. While looks and color can be of importance, any such customization also has to pay very serious awareness of the way it can promote the way you are able to handle the weapon and operate it.
Pistol grips must allow a rifle to point at any target naturally. It must also allow the person operating the weapon to waste very little time in aligning the sights. Delays here, especially in law and order situations can make any difference between life and death. The pistol grip should allow the rifle to be able to in the same position searching for shot is fired, without requiring any conscious effort on the part of the user. It should be able to use the straight thumbs method of holding the pistol, which is now considered the best way of holding a rifle. In this method, the supporting hand below the trigger guard has the thumb pointing to the front. The thumb of the shooting hand, which normal operates the safety mechanism is also rested on this thumb, also arranged to point forward.