Hi Tomas, well, I fixed the stove piping issue. I sent the Q100 Mk. 12 back to Global Ordnance, and got a new Mk. 23. No issues. That Mk. 12, was absolutely a defective gun. If I typed here what they told me they were going to do to fix it, after sending it back twice- you'd shake your head in disbelief. t was almost like they were kidding .My Smith & Wesson M&P 2.0 Compact, second gen, stove piped a bit when I first got it. After it broke in, it has not done that again, and is a great shooting, reliable gun. I did not see that happening with my Mk. 12 GP Q100. So- I just got a new gun. The new Q100 has been good so far.