"The second question is addressed to the action of the court in permitting a firearms expert, a man by the name of Peterson, to testify to conclusions based on his expert opinion that a pistol identified as the pistol which the defendant Tison had on the day of the homicide delivered to one of the other defendants was the same pistol with which the deceased victim of the homicide was killed.We have carefully read the testimony of Mr. Peterson and reached the conclusion that he was shown by the testimony to be fully qualified to testify as an expert in regard to firearms and to draw a reliable conclusion as to whether or not the bullet found in the body of the deceased was fired from [**40] the pistol introduced in evidence. The weight and credibility of his evidence was a matter for the jury to determine and apparently the jury gave credence to Peterson's testimony."