Um, don't get it... I've been through o-ring repair stuff, and it didn't do squat to the gun. I even went as far as gluing it down permanently, and it still leaks temperamentaly. I have spend 50$ on the gun and 20$ on a spare mag, and I would like to say that both leaked. The plastic on the slide cracks very easily (NOT a blowback), but just from normal handling and cocking. Performance is good and accuracy is EXCELLENT, and fps is typical. I would instead point you torward the cheaper and better Y&P m9.