Ben Simonson of Boresight Solutions performed his skillful modifications on my duty Glock 21 SF, which I have now carried for a number of years. On Oct. 29 2013, while on duty near the Miami Airport, I was attacked by a knife wielding assailant. During the struggle I received 12 stab wounds. The subject also tried to take my Glock, even biting the thumb on my right hand in his determination to get it. My hand was injured and covered in blood, but I was still able to grip and index the gun perfectly, thanks to the outstanding ergonomics and traction of the work Ben did, which I feel helped me win the confrontation. I owe Ben a debt of gratitude. Thank you Sir!!