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What is the benefit of performing proper feeding of the 1.75 inch shells if the shells are ineffective for defensive purposes? First, we conducted tests with quarter-inch plywood. Then we proceeded with the final design of the OPSol® Mini-Clip™. Eventually, we moved on to phone books and ultimately moved to bare FBI ballistic gel. After talking with Clear Ballistics, a leader in the ballistic gel industry, we decided to test their FBI ballistic Joe Fit Torso. So, standing at the FBI ballistic protocol distance of 10 feet from tip of barrel to target, we shot one birdshot, buckshot, and slug. These were shot at different areas of the gel torso.