Recently purchased a Glock 43 - six round mag, single stack 9mm. The popularity of the 9mm is established with good reasons. First shot accuracy with the little guns is not a problem. Accuracy suffers during rapid fire if the pistol is too light and size of the grip doesn't allow full purchase of the entire, hand. Grip strength is dependent upon the ring and little finger. If you doubt this, try hammering a nail using just the thumb, trigger and middle finger.
Some of the small pistols are not well suited for accurate shooting but excel at concealment. This gun is a challenge. Mag extension makes a lot of difference.