Hey guys, Just two weeks ago, I purchased the TM 5.1 Hi-Capa Gold Match. I had always used 1911s, but a this was my first ever Hi-Capa. Just today, I used it for a couple of games with normal green gas, as my propane was dying. On the third round, my Hi-Capa ran into a malfunction and shot one round and the slide did not go all the way back. Because I was in an engagement, I quickly racked the slide a couple of times and my problem was fixed. Later throughout the day, it happens again and again till the point where its not shooting correctly. I assumed it was lack of silicone oil and used silicone but the problem kept getting worse. I finally brought it to the technician at the park who was able to diagnose that my O-Ring was falling off. He fixed it but the problem happened again and the O-Ring had ripped. I asked the tech there and he had said that I should just replace the Blowback housing. He recommended a UAC Ultra Light Weight Aluminum Blowback housing ( http://www.evike.com/products/51971/ ) this is where I was wondering if you guys could give me suggestions on either other options for the blowback housing or for other upgrades I should do to my Hi-Capa that would make it even better. Thanks!