Trial court did not allow two defense experts to testify because the defendant failed to qualify them as experts. The court agreed saying, "In the instant case the two potential experts were not, we believe, experts in the field of ballistics. The fact that a person repairs guns, shoots them, and manufactures a gun part may make him more knowledgeable than the average citizen about guns in general, but it does not make him such an expert that it is an abuse of discretion to refuse to allow him to so testify."