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Posted: 12/27/2005 3:28:00 PM EDT
Armalite M15. Same mags/ammo.
Shot 100 rounds without problem.
Reloaded mags and started to shoot again.
10 rounds into 2nd shooting period and Bolt rode over cartridge and jammed half way down.
Cleared weapon. Field stripped and found no problems. Everything nice and tight, no excessive build up, etc.
Started to shoot again (no boing from buffer) and no problem until I noticed my hold against my body loosened.
Then jam occurred again with loose hold. Cleared weapon. Tight hold and no further jams.

Unusual situation?

TIA
Link Posted: 12/27/2005 3:39:33 PM EDT
Link Posted: 12/27/2005 3:49:25 PM EDT
The shooter's hold can make a difference in a recoil operated weapon, but a gas operated system shouldn't be at all subject to such variances. If your hold changed something about upward magazine pressure, that's a different story.
Link Posted: 12/28/2005 12:58:44 AM EDT
From your what you described, it sounds like you had a bolt-over-base failure, which is usually caused by a weak magazine spring. Rebuild/replace magazine and you should be good to go.
If the magazine is new, its possible its out of spec. I have two brand new Bushmaster magazines which are out of spec and will not work reliably. They look good and make excellent book ends.
If it is the magazine, which I am guessing it is, make sure to quarantine it from the good ones.
Link Posted: 12/28/2005 1:41:46 AM EDT
100 rnds is not exactly boken-in and a FtF is not a rare occurance during a break-in period.
Link Posted: 12/28/2005 3:09:23 AM EDT
goto trouble shooting section tweak has all your ansewers posted in a DIY format already posted.
Link Posted: 12/28/2005 3:23:18 AM EDT
[Last Edit: 12/28/2005 3:28:53 AM EDT by Tweak]
Link Posted: 12/28/2005 10:04:35 AM EDT
Fascinating! I was expecting the gas system to be completely independent of the weapon's overall inertial state, but you've shown that's completely wrong.

Was your collegue a small person, or was her stance and hold simply too loose?
Link Posted: 12/28/2005 1:03:32 PM EDT
Link Posted: 12/28/2005 2:10:35 PM EDT
I am 6'3" and 255 lbs. So hope stature doesn't have anything to do with ithanksWill continue to shoot, inspect and troubleshoot if needed.

BTW: Same ammo and mags used in shoot of NIB Colt LE6920, right out of the box , and no malfunctions.
Not looking to start manufacturer vs manufacturer thread/war! (already read the list the best manufacturer opinion thread)

Tweak:When you talk about swapping parts where they from same model and manufacturer?

Link Posted: 12/28/2005 2:12:58 PM EDT
After some shooting to get that tight bolt brokin in, you will be able to hip bump the gun.
Link Posted: 12/28/2005 2:25:49 PM EDT
[Last Edit: 12/28/2005 2:30:18 PM EDT by armaliteuser]
Thanks but that is why I have the AC556, Swedish K, MAC M11/9 and .380 (carried in shoulder rig). he And the technique is much easier to master.
Flip selector (except the Swedish K) pull trigger once.

But I am trying to master the ARs.


Link Posted: 12/28/2005 9:59:57 PM EDT
Link Posted: 12/29/2005 7:17:36 AM EDT
Link Posted: 12/29/2005 2:15:12 PM EDT
Factory buffer and will keep your suggestion in mind.
Back to the range Jan.2nd and will run the one that seems to give most problem and all my others.
Will also use in the Colt and see if it will reproduce problem in the Colt. (which did not happen last weekend)
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