M-14 rocking on auto

medic1050

medic1050

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Well I was trying to sight in both the iron sight and the scope on my Norinco 305. I had just purchased 500 rd of Pirv Partisan ammo and had lot of shot to fire. I was trying very hard for consistency in order to achieve good groups but every few rounds it would fire a 2 round burst. The third time it happened I pulled the gun from the range and took it home for a full strip and clean.

Everything appeared to be in good working order and I could not duplicate the event at home by manually playing with the parts. I thought perhaps the firing pin was dirty and sticking. I dropped the bolt into my ultra sonic parts cleaner and gave it a good scrubbing. After greasing and a light coating of protective oil everything was reassembled and I spent an hour dry firing with snap caps without repeating the error.

I returned to the range the next day and the bursts continued every so often but with no pattern. Maybe the ammo has soft primers and that is the root of the slam fires? All the ammo is from the same lot and machine according to the paper tag in each box. I cycle through 20 rds manually and not a single slam fire but if I shoot I couldn’t fire 5 without one.

Finally I had it, I must be the cause. While squeezing the trigger slowly and smoothly trying to be surprised by the break (I practice dry firing with a penny on the front sight, the coin should not fall with the break of the trigger.) I was inadvertently causing a bump fire. My trigger pull was so light that as the rifle recoiled the trigger sear would reset and the second round would fire as the rifle came forward again. It couldn't be that simple I thought... Pulling the trigger just a slight bit harder ended the bump fire. 100 more rounds and not a single one.
I was a combat engineer for 7 years before becoming a civvy paramedic I never had that happen with C-7.
 
sometimes it's the ammo, sometimes it's the gun,and sometimes it's the shooter- there are stories of the m16 going full auto ( the early ones) and it's EVEN EASIER to do than on the 14 platform- not as easy as the matchstick and the fn, but it's right in there somewhere
 
"...trigger pull was so light..." It isn't the trigger or the ammo. It's you. You're releasing the trigger too soon and the trigger gets pulled again under recoil. Happens fairly regularly when new shooters(or new to the rifle shooters) are shooting an M14 style rifle off a bench. Exciting, but not particularly dangerous.
Hold the trigger back until the rifle is finished recoiling and it'll go away. It's called following through on the shot.
 
The exact same thing happened to me. I shot mine for the first time at the range, and the very first time I fired it 2 rounds came out. I had it resting on a sand bag, I wasn't expecting it and I accidentally shot down the cable at the range. I was using Winchester ammo.

This has also happened to me ALOT with my SKS using the 7.62x39 surplus stuff too.
 
Yes, it is the shooter habit that is affecting this occurrence. Particularly with triggers that have longer overtravel, shooters who try to hang midway after trigger break (and not go to the triggerstop) will likely have this happen on recoil.
 
Ive been using prvi steadily for about the past 2 months in my near new m14s and i have never had this happen , even with my moderate at home trigger job .

Did i miss read your post or did you say you lubed your firing pin ?
 
WoW!
b:
Honestly that seems really odd. I have never heard of something like this before but then again I have never heard of someone lubing there free floating firing pin either. I would dis-assemble the bolt & douse it with brake cleaner. Then exam the cavity were the firing pin is and see if there is anything stick-en out of place. Also when I re-assemble my free floating firing pin's I always check to make sure it rattles freely. Now once I re-assemble it I all I preform the rack test.
  1. Pull triger.
  2. While tigger is still pressed I rack the op-rod.
  3. Then I slowley release the trigger and see if it drop's the hammer.
If it fails this test then I would strongly recommend getting it to an M14 guru to fix. If it passes then it's a sticky firing pin issue.
When you resolved this issue please post back so we can use this remidy if any further issues occur like this 1.
 
My friend had a similar problem with his AR15. The culprit turned out to be a disconnector spring that had simply been installed upside-down. The very slight difference between the width at the top and bottom of the spring were enough to cause some instability in the trigger pull and thus, unintentional "bump" fires.
Might want to consult a gun smith before you try again.
 
Normal - learn the M14 trigger

medic1050 said:
Well I was trying to sight in both the iron sight and the scope on my Norinco 305. I had just purchased 500 rd of Pirv Partisan ammo and had lot of shot to fire. I was trying very hard for consistency in order to achieve good groups but every few rounds it would fire a 2 round burst. The third time it happened I pulled the gun from the range and took it home for a full strip and clean.

Everything appeared to be in good working order and I could not duplicate the event at home by manually playing with the parts. I thought perhaps the firing pin was dirty and sticking. I dropped the bolt into my ultra sonic parts cleaner and gave it a good scrubbing. After greasing and a light coating of protective oil everything was reassembled and I spent an hour dry firing with snap caps without repeating the error.

I returned to the range the next day and the bursts continued every so often but with no pattern. Maybe the ammo has soft primers and that is the root of the slam fires? All the ammo is from the same lot and machine according to the paper tag in each box. I cycle through 20 rds manually and not a single slam fire but if I shoot I couldn’t fire 5 without one.

Finally I had it, I must be the cause. While squeezing the trigger slowly and smoothly trying to be surprised by the break (I practice dry firing with a penny on the front sight, the coin should not fall with the break of the trigger.) I was inadvertently causing a bump fire. My trigger pull was so light that as the rifle recoiled the trigger sear would reset and the second round would fire as the rifle came forward again. It couldn't be that simple I thought... Pulling the trigger just a slight bit harder ended the bump fire. 100 more rounds and not a single one.
I was a combat engineer for 7 years before becoming a civvy paramedic I never had that happen with C-7.
Click to expand...
You have a normal trigger - as your description of your experience describes -

Slow light pull causes the sear to release and you relax your finger immediately.

The relaxation of the finger muscle prior to full pull causes bump fire.

With all my extreme M14 target work I load only one rd. at a time at all the CFO fearful ranges .

:ar15:
swingerlh.gif
 
Same thing here. Did it today. Was shooting prone and fired a two round burst. Was fun. Haven't fired auto since I was in the forces. The problem was me. Firing pin is good to go the trigger is resetting properly. Need to be careful about follow through that's all.
 
The irresponsible guy in me wants to tell you about hooking your thumb through the loop in your pants and then carefully pulling the rifle back to bump-fire the gun until the whole mag is dumped, or about hooking an elastic around a pencil behind the trigger - but that would be irresponsible. Don't do that stuff.
 
i could dare to say and follow the norc manual which says that use of commercial non military ammunition might cause slam fire...the rifle is meant for 7.62 nato traditionally hard primers afterall, but then again, i never had the problem. My m14 fired south african 7.62, 180 grain remmington 308 soft points, 150 grain american eagle 308, etc with no bump fires for 500 rounds with at least 4 different folks with varying experience firing this rifle...i could say that perhaps you have a batch of soft primers on hand...try some 7.62 nato see if it occurs again,,,then you will know for sure its the rifle, not the ammo
 
Ive used almost every available ammunition is this firearm so far and have also never had this happen , Federal power shok .308 150 grain , 180 grain S&B .308 , Portuguese surplus 147 grain , winchester supreme competition 168 grain match .308 , winchester 180 grain soft point , 180 grain silver point , PRVI 147 grain .308 and some mfs silver case stuff.

Ive also purposely tried to cause a slam fire and with the magazine in , in my opinion does not have enough force to cause a slam fire.

Just ensure you have the rifle good and tight to the shoulder . I shoot nice and slow squeezes and havnt been able to duplicate this concern .
 
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