I have a Tokyo Mauri G17. The TM has a plastic slide and you're suppose to use 134A gas that has less power. I don't have a source for 134A and ran it with propane. The green gas and propane are too strong. Broke it 3 times. The last time it broke the front of the slide clear off. I've had no problems with my metal guns. The metal ones are WE-Tech. Nothing against TM. It was a great gun while it lasted. They are serious when they tell you to use 134A on a gun with a plastic slide.