As much as I/We shoot the AR... I've never broken or seen one break. Not even in classes.
Bolt failed under 2,500 rounds
Bolt failed under 5,000 rounds
Over 5,000 rounds with no bolt failure
Bolt failed under 10,000 rounds
Over 10,000 rounds with no bolt failure
Bolt failed under 15,000 rounds
Over 15,000 rounds with no bolt failure
Bolt failed under 20,000 rounds
Over 20,000 rounds with no bolt failure
Bolt failed: unknown number of rounds
As much as I/We shoot the AR... I've never broken or seen one break. Not even in classes.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
Just like you I've seen several carbine systems but haven't yet on mid lengths. I have about 12k through one of my DD middies and 9k through my BCM middy. Mostly 5.56 lake city too.
I want to make sure I read correctly. You only want to know about Mids. Not carbines and not rifles, correct?
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
We have solid data going back to the mid 1960s about the difference in longevity between carbine and rifle bolts. It woul be hard for me to imagine mid length barrels not splitting that difference.
I've been oresent for the breaking of bolts but I trade guns around too much to have that many rounds through one bolt.
I have not seen mid-lengths break a bolt yet, but none of the mid-length AR15's here have more than 10-12K though them at the moment. You should talk to Pat Rogers, as he has some high round count mid-lengths.
It was fired around 1,300 rounds every three days or something. I will find the link to get exacts. I am sure its harsh firing schedule is the reason for earlier failure.
"Every round that has gone down that barrel has been fired at class, with an average of approximately 1,300 rounds every three days......
At Prairie du Chien, Wisconsin, in May 2009, it had several failures to extract, and the extractor spring was replaced at 13,010 rounds. This is far beyond the normal extractor spring life under these conditions.
At Wamego, Kansas, in June 2009, two bolt lugs broke at 16,400 rounds. We replaced the BCG. Considering the firing schedule, this is within normal parameters."
http://www.slip2000.com/blog/s-w-a-t...ine-filthy-14/
Last edited by Zane1844; 06-06-13 at 16:51.
Sorry if I was unclear.
We know the theories, assumptions, and other people's published accounts.
What I am looking for is individual, personal, first-hand reports of bolts breaking in midlength gas 5.56 Stoner operating system based carbines.
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