[hitman]

I was just reading something on M4carbine and guys are saying that 6.8 bolts are failure prone and can fail after 1500 rounds. I know this sounds like total BS to me but is there anything to it? Thanks

 

[ron169]

I was just reading something on M4carbine and guys are saying that 6.8 bolts are failing after 1500 rounds. I know this sounds like total BS to me but is there anything to it? Thanks

Did he get the 6.8 confused with the 6.5?

 

[constructor]

BS, I have never heard of 1 bolt failing, nor has Doc GKR or ART who are around during most of the military tests.
If anyone would have broken a bolt it would have been me.

 

[constructor]

I was just reading something on M4carbine and guys are saying that 6.8 bolts are failing after 1500 rounds. I know this sounds like total BS to me but is there anything to it? Thanks

Provide us with a link, so I can enlighten the confused :lol:

 

[hitman]

It is really long post. I attached a link to it. Its only mentioned that they may have bolt failures etc..
http://m4carbine.net/showthread.php?t=1 ... ics&page=3

 

[ron169]

It is really long post. I attached a link to it. Its only mentioned that they may have bolt failures etc..
http://m4carbine.net/showthread.php?t=1 ... ics&page=3

Wow thats a really old thread, 3 years old now... hehe

 

[constructor]

:lol: that was when Bill A was trying to tell everyone the reason his bolt face was deeper was to make it stronger and he "engineered" it that way :lol: That fact is he was opening up 5.56 bolts and had to machine out the shadow line, then make up a good story as to why they had a deeper recess. He actually said his bolts were stronger than a 5.56 or 6.8 so strong in fact he had to impose a 52000psi limit to try to keep them from breaking.
On the Grendel site they have a "Broken bolt" club. Strange that we don't have one of those.. Dammit they have something we don't
This all brings back fond memories of week long arguments :lol:

 

[rushca01]

And to think I once considered buying a 6.5....that was before I found this site. Glad I went with the 6.8!

 

[Test_User]

We have bolts with 4x that out there that have had the vast majority of those rounds having pressures at or over 60K. Some bolts (the upgraded ones) have had a hundred or so of proof load 70K pressure rounds thru it ( for durability testing purposes)and thousands upon thousands of loads in the 60K without issue by Constructor.