Interesting. I too have run some of the O.S. .15 's but have not encountered that exact problem ( yet ). Some will say to switch to the Magnum .15, but it has its' own set of issues and you already own the O.S. Unfortunately, I have no proposed solution, but you may want to also look through the RCCA website, if you haven't already, here http://www.rccombat.com/forum/default.asp. There is not a ton of daily activity there, but it is very specific and checked by the members often. A new posting there may reach the right peoplethere pretty quickly. Keep us posted here if you find the solution. Good luck.