M305 ftf

Spearhunter

Spearhunter

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My rifle started to have feeding issues when I fired about 50 rounds using Norinco ammo. It was always the same issue: When the bolt carrier returns, it failed to feed a round in so I would end up dry firing. This happened intermittently, every 1 or 2 rounds in between. Initially I thought the ammo was not seating properly in the mag but everything looked fine.

When I took the rifle apart, I noticed the op rod spring guide was not locked down by the pin. I was able to remove the spring guide without pushing the locking pin sideways. The op rod spring guide I am using is from S&J Hardware. The stock is the orig. black synthetic.

I did some reading around and read about the popsicle stick mod but I'm not sure if that applies to my rifle?

Any thoughts here?

Thanks.
 
Spearhunter said:
My rifle started to have feeding issues when I fired about 50 rounds using Norinco ammo. It was always the same issue: When the bolt carrier returns, it failed to feed a round in so I would end up dry firing. This happened intermittently, every 1 or 2 rounds in between. Initially I thought the ammo was not seating properly in the mag but everything looked fine.

When I took the rifle apart, I noticed the op rod spring guide was not locked down by the pin. I was able to remove the spring guide without pushing the locking pin sideways. The op rod spring guide I am using is from S&J Hardware. The stock is the orig. black synthetic.

I did some reading around and read about the popsicle stick mod but I'm not sure if that applies to my rifle?

Any thoughts here?

Thanks.
Click to expand...
Popsicle mod should not be needed if its the original stock, the spring guide should be installed flat side to receiver and pin should then easily move in to place, is this happening with yours, take a pic and post please.

[youtube]ZYqeyISsezo[/youtube]
 
Thanks. I'll try to reassemble it tonight to how it was when I took it apart. I'll post pictures. Hmmm...is it possible I had had failed to make sure the locking pin was engaged when I last assembled it?
 
Spearhunter said:
Thanks. I'll try to reassemble it tonight to how it was when I took it apart. I'll post pictures. Hmmm...is it possible I had had failed to make sure the locking pin was engaged when I last assembled it?
Click to expand...

I dont think the stock will fit on if the pin isn't pushed in on the black synthetic stocks, mine wouldn't anyways.
 
While your prose is a bit difficult to decipher, what I think may be happening is that the bolt is going rearward enough to eject the spent case; but not far enough back to pick-up the next round from the mag, yes?

Is everything well greased?
 
Also Spearhunter please check...
To make sure that your stock linner is properly matting not only with the reciever but also the stock it's self.
Your piston's small cavity is clear of carbon and not only the large 1.
Make sure the gas switch is not in the off position.
Also please post back if this is a chop mod or orignal length.
 
Splatter said:
While your prose is a bit difficult to decipher, what I think may be happening is that the bolt is going rearward enough to eject the spent case; but not far enough back to pick-up the next round from the mag, yes?
Click to expand...

Yes it was a challenge to describe ;) I'm sure a picture will help and will post it just as soon as I can.

But no, it's not a case of the bolt not going far enough because I clearly remember this happening once after I slapped in a new mag with the bolt in open position. That is why I initially suspected the bullet/mag was not in the mag well far enough.

Splatter said:
Is everything well greased?
Click to expand...

Yes.
 
Satain said:
Also Spearhunter please check...
To make sure that your stock linner is properly matting not only with the reciever but also the stock it's self.
Your piston's small cavity is clear of carbon and not only the large 1.
Make sure the gas switch is not in the off position.
Also please post back if this is a chop mod or orignal length.
Click to expand...

Thanks Satain,

The piston was clean and I will check the cavity again over the weekend. I ran a wad inside and it came out black in some parts but it wasn't overly dirty or clogged.

The gas tube in in on position and other than replacing the Op rod spring guide and installing a tri rail, everything else is stock, no mods.
 
The pin should not be able to move once the action is in the stock. Also, the pin can not go in unless it aligns with the oblong hole in the guide rod.

So, install spring and guide rod, push forward on guide rod while pushing in pin, ensuring engagement and that the guide rod is indeed captured by the pin, then assemble action to stock.
An inspection of the right hand side wall where the pin locates would be good. To ensure no cavity is there to allow the pin to walk out. It only needs to move 1/8" to cause problems.
 
Not sure if this was the cause of the FTF but I know the op rod spring guide was not held down by the locking pin. Take a look at these photos and see if you spot what is wrong:

DSC01249.JPG


DSC01247.JPG


DSC01246.JPG


DSC01237.JPG


And here are pictures of how it should have looked like:

DSC01243.JPG


DSC01245.JPG


DSC01235.JPG
 
Actually I pushed the locking pin in too soon so the oblong hole of the op rod spring guide was never held securely by the pin. The guide was held in place only by the pressure of the spring and the angled end of the guide.
 
As a follow up, would the loose spring guide cause accuracy issues? About the time the FTF started, I had just switched from 25 yds to 40 and I noticed my POI began to go haywire.
 
I'm surprised the magazine stayed in place. There would not have been any "click" whatsoever, because the pointed end on the guide is the clip which secures the magazine.

After the first firing, the jolt should have sprung the mag free of the rifle both due to the weight of the mag with four rounds left in it and the jarring action.
 
The fit is fairly tight so the mags stayed put. I switched to the 5/20 after the first FTF thinking the 5 round mag wasn't working well. I think it also helped that I would use the 5/20 mag as a rest in between shots.
 
Spearhunter said:
Not sure if this was the cause of the FTF but I know the op rod spring guide was not held down by the locking pin. Take a look at these photos and see if you spot what is wrong:

DSC01249.JPG


DSC01247.JPG


DSC01246.JPG


DSC01237.JPG


And here are pictures of how it should have looked like:

DSC01243.JPG


DSC01245.JPG


DSC01235.JPG
Click to expand...
After seeing this :HR: I can now say with confidance that this case is closed!
LoL!!!
Have fun blasting Spearhunter ;)
 
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