Ron Since son has been an Airsoft crank for some years now and I’ve got a couple of dents in my head from opposing forces, I can tell you all Airsoft bb’s are not equal. 15 gram to 45 grams with same diameter and the 45’s at 450 FPS will darned sure draw blood and leave a heck of a welt. I’ll spare you the pictures. So using the 15’s or 25’s and drilling a hole in them to provide a point of collapse would be my suggestion. Trapped in that hole they won’t collapse easily. Getting the whole BC improved shape to collapse inward enough and soon enough will be the key to getting that open point to do its work. Kudos for the whole effort and best regards.
