I do. One thing with the King Tiger is that the barrel is quite long. The ideal length of an inner barrel is about 150mm. Any longer you will need the small hole drilled into the inner barrel. I have one in my King tiger and it works great although it is not optimal given that the inner barrel is well over 300 in length. Since I sold you your gun I've discovered a few more things which make the guns even better. You will notice a marked improvement with the new one. You will however have to drill out your KT barrel somewhat to fit the new inner sleeve. Its a real pain taking out the stock aluminium one but it does come out.