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Thread: What parts have you broken...
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6 December 2020, 13:44 #16
Watch your round count. The guy that owns Battlefield Vegas posted his observations a couple years back on TOS, and lugs break off Toolcraft, and stock Colt bolts at around the 20k round count. Of course, for him, that could be two weeks, for others, it could be several lifetimes..
There's no "Team" in F**K YOU!
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6 December 2020, 16:05 #17
Yeah a heavy firing schedule makes a big difference. At every 3K rounds I swap all the springs, consumable ones that is. When you change an extractor spring its wise to do the ejector spring and ejector as well. They work together and the timing has to be spot on. At 6K rounds I do the springs again, a new bolt, firing pin and cam pin.
The best way to survive a violent encounter is to be the one inflicting the most violence.
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6 December 2020, 16:43 #18
For example when I go to a match, I take a spare rifle in case I have a catastrophic failure or one that would take a ton of time to fix.
My parts kit includes the basics: spare bolt (not entire BCG), gas rings, firing pin and basically any other spring that can be accessed fairly easily (trigger, that type of thing).
I got in a bad habit a few years ago building rifles around the spare bolt carrier groups and other parts that I had amassed that were simply supposed to be “in case of” items. Oops
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2 January 2021, 09:57 #19Contributing Member
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3 January 2021, 10:07 #20
Molon, any idea what the round count was on those firing pins when they broke?
The best way to survive a violent encounter is to be the one inflicting the most violence.
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8 January 2021, 14:09 #21Contributing Member
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9 January 2021, 10:35 #22
Thanks. Titanium is known for having "brittle" characteristics, I always wondered why they were making FP's out of it... Dry firing may be putting stress on the firing pin without having resistance such as a casing on the other end of it. Just a theory.
The best way to survive a violent encounter is to be the one inflicting the most violence.
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9 January 2021, 14:46 #23
It's my understanding that Titanium firing pins have less mass than steel. The idea is the lower mass creates less chance of a slamfire, since an AR firing pin does not typically have a return spring. People also believe it lowers "lock time" as well, meaning the gun will go into battery more quickly. I personally would not use one on anything but a recreational .22lr.
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10 January 2021, 09:44 #24
Interesting, thanks MD. Three out of four of the broken pins were titanium. Not a good average...
The best way to survive a violent encounter is to be the one inflicting the most violence.
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10 January 2021, 12:54 #25
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10 January 2021, 15:00 #26
I'm obviously not an expert on the subject but I have seen several instances where titanium looks like it was the failure point, or at least was what was being blamed.
From my reading titanium gets brittle at low temperature. One guy put his hunting rifle in his truck overnight with a titanium can on the end of it.
The next morning it was super cold and on the first shot a seam open up length wise on the suppressor right where the engraving was at. It split it open.
Given it rarely gets cold where I am at but if I lived in North Dakota it might be something to research.
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13 January 2021, 16:18 #27Contributing Member
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13 January 2021, 16:44 #28
I think where it comes from matters. A couple years ago I had a conversation with Joel of V Seven about titanium fire pins. My inquiry was about how much it would affect lock time, and about pin breakage. He recounted to me a conversation he had with Bill Geissele about lock time, and that titanium firing pins were close to worthless when it came to any advantages regarding lock time. Basically it boiled down to how much firing pin acceleration are you really going to gain in that 1/8 in. of travel, under hammer fall energy, by shaving a few grams? And that you’d be better served by a trigger with a faster hammer if lock time was your actual goal.
As for breakage he told me most people were/are making titanium firing pins out of the hardest titanium available (I can’t remember which grade he specified, but he DID specify one) and that due to this they tended to be somewhat brittle. He also said his titanium pins were made of a slightly softer, much tougher grade and that out of all the ones he had sold, only one customer had reached out with a potential issue. It had chipped very slightly at the tip but was still running 100% and did not result in a sharp edge or the piercing of primers. V Seven eagerly sent him a replacement anyways.
He also mentioned they also really only made them for the “hyper light” AR crowd, but still wanted to execute them as flawlessly as they could, which definitely stands by true V Seven form.-One Nation, Under God
-"The bad news is time flies. The good news is you're the pilot." ~ Michael Althsuler
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13 January 2021, 17:24 #29