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Old 01-23-2019, 10:53 PM   #1 (permalink)
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O-ring TPC, does it make a difference?

I have always worried when a bolt doesn't come with one, but how much of a difference do they really make?
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Old 01-23-2019, 10:58 PM   #2 (permalink)
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The big oring on the bolt edge seals the breech, without it you’ll lose efficiency.
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Old 01-23-2019, 11:07 PM   #3 (permalink)
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Quote:
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The big oring on the bolt edge seals the breech, without it you’ll lose efficiency.
I meant when a bolt doesn't come with a TPC that has an o-ring, not the bolt itself
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Old 01-23-2019, 11:09 PM   #4 (permalink)
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The tpc oring does the job of the plastic set screw, only better. Just there as a "thread locker".
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Old 01-23-2019, 11:14 PM   #5 (permalink)
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The tpc oring does the job of the plastic set screw, only better. Just there as a "thread locker".
That's what I understood, but started to wonder if they make that much of noticeable difference
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Old 01-24-2019, 01:55 AM   #6 (permalink)
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Yes they do. Over the long run the nylon wears down and looses grip. I've had some of them get stuck as well. O-ring TPC is one stop solution. Make sure to leave the nylon nut in the bolt just not sticking into the threads. Once in a great while if you remove the nut or back it out too far, the o ring gets caught in the hole and bind or break.
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Old 01-24-2019, 07:53 AM   #7 (permalink)
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It saves you having to tighten the nylon set screw from time to time. Nothing more.
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Old 01-24-2019, 08:29 AM   #8 (permalink)
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I shot my Phantom for years before the o-ring TPC was released. A Phantom will work perfectly fine without one. They're really more of a nicety so that you don't need to worry about the nylon screw as much.
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Old 01-24-2019, 09:29 AM   #9 (permalink)
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AH, this is a newer thing that I was ignorant of, nice to learn something new!
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Old 01-24-2019, 10:22 AM   #10 (permalink)
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The set screw was a pain with center or left feed bodies. You had to back it out to turn the tpc and adjust velocity, but it was only accessible through a right feed body. So velocity adjustment required disassembly, screw loosening, reassembly, velocity adjustment, disassembly, screw tightening, reassembly. Not terrible with an overbarrel pump and thumbscrews, but add in a vsc and undercocking kit and your chrono time could reach rediculous proportions.
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