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Posted: 12/27/2005 3:39:33 PM EDT
[#1]
I don't see how unless your shooting really weak ammo. Check your gas system, carrier key, is it loose? also check your carrier make sure its not hanging up on anything.
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Posted: 12/27/2005 3:49:25 PM EDT
[#2]
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.
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Posted: 12/28/2005 12:58:44 AM EDT
[#3]
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. |
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Posted: 12/28/2005 1:41:46 AM EDT
[#4]
100 rnds is not exactly boken-in and a FtF is not a rare occurance during a break-in period.
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Posted: 12/28/2005 3:09:23 AM EDT
[#5]
goto trouble shooting section tweak has all your ansewers posted in a DIY format already posted.
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Posted: 12/28/2005 3:23:18 AM EDT
[#6]
you'd think that but it's not true, even a gas op system needs resistance, that's why the 6,000 round endurance test requires "unrestrained" firing at certain intervals, it's a VERY good test of the strength of the recoil. CAUTION war story time I had a LE gal bring me her duty rifle (BFI carbine) one night, said it was FtF, FtEj intermittently. I tore it down, checked every part inspected her mags (USGI) and ammo (Black Hills blue, issued) found no defs except the poor key stakes. next day took it to the range, loaded it up and short stroke tested it ten times, good to go on each one, put a mag and a half through it from the shoulder as fast as it would run, no malfs. Handed it to her, her first round FtF, then sporadic FtF and FtEj from there on for the rest of the mag. I short stroke tested it "unrestrained" and it failed every time. We narrowed it down to the gas port by parts swapping, knew it was smaller than normal from previous inspection but wanted to check all the other variables first. Opened the port up to standard size and it ran like a top once I whacked the FSB over to TDC. This is how we test clones now   short stroke test it
direct link checklist |
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Posted: 12/28/2005 10:04:35 AM EDT
[#7]
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? |
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Posted: 12/28/2005 1:03:32 PM EDT
[#8]
she was very tiny (rare in a fem cop) but I could get her rifle to short stroke by shooting it one handed
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Posted: 12/28/2005 2:10:35 PM EDT
[#9]
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? |
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Posted: 12/28/2005 2:12:58 PM EDT
[#10]
After some shooting to get that tight bolt brokin in, you will be able to hip bump the gun.
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Posted: 12/28/2005 2:25:49 PM EDT
[#11]
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. |
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Posted: 12/28/2005 9:59:57 PM EDT
[#12]
they were known good parts from my tool box used just for diagnosing rifles |
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Posted: 12/29/2005 7:17:36 AM EDT
[#13]
Check the mags and make sure they are not binding the carrier.
What type of buffer are you using? Some have said that changing to an H-Buffer has corrected this problem for them. If all else fails it would not hurt to give it a try. |
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Posted: 12/29/2005 2:15:12 PM EDT
[#14]
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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