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9/22/2017 12:11:25 AM
Posted: 3/2/2006 4:17:13 PM EDT
Has anyone else had problems with the bolt locking lugs cracking on their Colt M-4's?
Link Posted: 3/2/2006 4:41:31 PM EDT
I thought that wasn't supposed to happen, what with Colt's uber-MP-tested-everything........
Link Posted: 3/2/2006 4:42:06 PM EDT
cool aid anyonehippie.gif
Link Posted: 3/2/2006 4:48:08 PM EDT
who has had one crack?
Link Posted: 3/2/2006 4:49:00 PM EDT
It can happen. There is a lot of stress at the 90 degree angle on the bolt locking lugs. The problem can be made worse if tiny pitting develops there due to corrosion or poor maintenance.
Link Posted: 3/2/2006 6:31:55 PM EDT

Originally Posted By rideage:
cool aid anyone


I'll have a 55 gallon drum, please!
Link Posted: 3/3/2006 2:03:50 PM EDT
We are statring to see them crack at around 7500 rds., and wondering if anyone else has seen the same.
Link Posted: 3/3/2006 2:14:00 PM EDT
Eventually they always crack. The shorter the barrel, the sooner they crack. Colt warranties M4 bolts for 7,000 rounds.
Link Posted: 3/3/2006 3:47:28 PM EDT
Word is that Colt M4 bolts are lasting about 20,000 rounds. Last I heard anyway.

Are these M4's, or M4A1's or are they rebuilds?
Link Posted: 3/3/2006 4:00:24 PM EDT

Originally Posted By Ekie:
Are these M4's, or M4A1's or are they rebuilds?



+1 to this question and who is "We"?
Link Posted: 3/3/2006 4:43:34 PM EDT
Mostly M-4A1's but a few M-4.
Link Posted: 3/3/2006 5:16:01 PM EDT
[Last Edit: 3/3/2006 5:26:53 PM EDT by Ekie]

Originally Posted By HUCK70:
Mostly M-4A1's but a few M-4.



These new Carbines? If so they would have a W prefix and come in a box like this (this one W338323):







Also with the M4A1 you can toast the bolt sooner doing a bunch of mag dumps.
Link Posted: 3/3/2006 6:05:25 PM EDT
I have never seen one new in the box, thanks for the info
Link Posted: 3/3/2006 10:01:07 PM EDT

Originally Posted By HUCK70:
I have never seen one new in the box, thanks for the info



Don't understand how you would know round count if you don't receive them NIB?
Link Posted: 3/4/2006 3:15:27 AM EDT
The armory takes them out of the box and issues them to individuals. After a exercise the number of rds is turned into the armory and they track it.
Link Posted: 3/4/2006 5:18:25 AM EDT
OK, I follow you.

There were some rebuilds on M16A2 lowers issued out last year, and I don't know if they used the original bolts or not. If so I would not expect them to last long. And like I said before doing lots of mag dumps with the M4A1 like it is a subgun will wear it fast.
Link Posted: 3/4/2006 5:50:46 AM EDT
You only need 2 locking lugs anyway, the rest are there for looks...
Link Posted: 3/4/2006 9:52:48 AM EDT

Originally Posted By HUCK70:
Mostly M-4A1's but a few M-4.



I take it a m4a1 is full auto and a m4 isnt?? But I thought both were full auto.
Link Posted: 3/4/2006 10:44:58 AM EDT
Uh, ohhhh. Kool Aid to the rescue!
<--------------------------------
Link Posted: 3/4/2006 11:02:32 AM EDT

Originally Posted By ar_mcadams:

Originally Posted By HUCK70:
Mostly M-4A1's but a few M-4.



I take it a m4a1 is full auto and a m4 isnt?? But I thought both were full auto.



The M4 is tri-burst. The M4A1 is full auto.
Link Posted: 3/4/2006 2:51:02 PM EDT

Originally Posted By Ekie:

Originally Posted By HUCK70:
I have never seen one new in the box, thanks for the info



Don't understand how you would know round count if you don't receive them NIB?





Unless maybe you begin your count at the time of a barrel replacement - or bolt, etc.

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