Help with my M305's

Jahkazz

Jahkazz

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Howdy!!
I've read the stickies, watched plenty of M305 videos but haven't found anything, or maybe I missed the information to help with my problems.

#1 My shorty has as rounded edge on the bottom of the left bolt lug so when the safety switch is engaged sometimes it slips off without warning. It also looks like when the bolt is pulled to the back of the receiver it is also pushed up, which makes the safety catch sit lower on the lug (rounded edge) and compounds the problem.

#2 I have a 22" in a Sage Chassis with an upgraded op rod that was functioning great, then started to bump fire? (pull the trigger and 2 shots go off).
Not all the time but often enough, I am using the Norinco Copper Washed Surplus.

What say the M305 masses?

Thanks in Advance!!
 
I had the same problem with my bolt being rounded off where it meets the bolt catch. When i changed mags sometimes it would slam shut on me. I fixed mine with a spot of weld and then filed it to a more square shape.Works great now.
 
#2 sounds like "maybe" you have a trigger/sear/disconnect issue. I'd check that and also give your gas system a full and thorough cleaning/de-carboning. But I'll go with the "maybe" you have a trigger problem.

#1 - I haven't seen the bolt wearing in that spot too often previous to the 2010/2011 imports. There was a batch of these rifles imported in last 5 years that do seem to be giving folks bad experiences. I stopped working on them right around that time. (2012ish)
There were many soft bolt latches reported for a few months here but haven't seen any complaints lately.
Over the years I've most bought from Dark International (many years ago) , then Marstar and a few from Al Simmons (marstar import). Been very happy with those models. ;)

Can't offer a remedy for #1 without a full inspection of the related parts.
 
ptalmey said:
I had the same problem with my bolt being rounded off where it meets the bolt catch. When i changed mags sometimes it would slam shut on me. I fixed mine with a spot of weld and then filed it to a more square shape.Works great now.
Click to expand...

Thanks, spot welding has crossed my mind.
 
45ACPKING said:
#2 sounds like "maybe" you have a trigger/sear/disconnect issue. I'd check that and also give your gas system a full and thorough cleaning/de-carboning. But I'll go with the "maybe" you have a trigger problem.

#1 - I haven't seen the bolt wearing in that spot too often previous to the 2010/2011 imports. There was a batch of these rifles imported in last 5 years that do seem to be giving folks bad experiences. I stopped working on them right around that time. (2012ish)
There were many soft bolt latches reported for a few months here but haven't seen any complaints lately.
Over the years I've most bought from Dark International (many years ago) , then Marstar and a few from Al Simmons (marstar import). Been very happy with those models. ;)

Can't offer a remedy for #1 without a full inspection of the related parts.
Click to expand...

Had a look at the trigger assembly and couldn't see any problems, but I will give the gas system a good cleaning.
The bolt on the Shorty has been like this since new, so I assume it was like that from the factory.
Thanks for the input!!
 
Jahkazz said:
#2 I have a 22" in a Sage Chassis with an upgraded op rod that was functioning great, then started to bump fire? (pull the trigger and 2 shots go off).
Not all the time but often enough, I am using the Norinco Copper Washed Surplus.

What say the M305 masses?

Thanks in Advance!!
Click to expand...

Just curious: does your 22" in the Sage pass the "hammer follow" portion of the "function test"?
 
I've recently worked my way through a malfunctioning trigger group, and might be able to help. If you take out your trigger, #### it, fire it, and only release the trigger to the 2ed stage. Do not fully release the trigger. What you want to see is how much connection there is with the hammer and rear sear. There should be a decent amount of contact. I know this is vague, but it shouldn't be hanging on by a hair. If it is, chances are vibrations from firing the gun is probably releasing it and why your gun is doubling. Here the top picture shows the trigger group which has it's sear and hammer engagement hanging on by a thread. This trigger group was bumping on me. The bottom trigger group is one that works fine. You can see the difference in sear and hammer engagement. Take a look at your trigger group, and let us know.



 
Gobc...........checked it out and that doesn't seem to be my problem, looks like I have good contact.
Thank you for the suggestion and pictures!
 
Odd Shot said:
Just curious: does your 22" in the Sage pass the "hammer follow" portion of the "function test"?
Click to expand...

Odd Shot........if this is what you are referencing:

Firstly, ensure it is unloaded, pull the charging handle to the rear and release. The hammer should be locked to the rear. Place the safety on, and try to pull the trigger. You should not be able to make the hammer release despite moderate pressure. Now take the rifle off safe, pull the trigger...the hammer should be released and make contact with the bolt. Now keeping the trigger pulled to the rear, while pulling the chargin handle to the rear and release...keeping the trigger pulled to the rear and hold. The hammer should be caught by the sear and be locked to the rear. Fire the action, keep the trigger to the rear and cycle the action 4 or 5 times again. The hammer should be engaged by the sear initially and remain locked down. Now with the hammer fully back and engaged by the sear....slowly release the trigger, the hammer should come off the sear and be engaged by the trigger. Pull the trigger and the action should fire.

It does not pass the second part, the hammer does not stay locked down with the trigger pulled and cycling the action. So it seems it is probably an issue with the trigger assembly fitting the stock.
Thanks, good call!
 
Jahkazz said:
Odd Shot........if this is what you are referencing:

Firstly, ensure it is unloaded, pull the charging handle to the rear and release. The hammer should be locked to the rear. Place the safety on, and try to pull the trigger. You should not be able to make the hammer release despite moderate pressure. Now take the rifle off safe, pull the trigger...the hammer should be released and make contact with the bolt. Now keeping the trigger pulled to the rear, while pulling the chargin handle to the rear and release...keeping the trigger pulled to the rear and hold. The hammer should be caught by the sear and be locked to the rear. Fire the action, keep the trigger to the rear and cycle the action 4 or 5 times again. The hammer should be engaged by the sear initially and remain locked down. Now with the hammer fully back and engaged by the sear....slowly release the trigger, the hammer should come off the sear and be engaged by the trigger. Pull the trigger and the action should fire.

It does not pass the second part, the hammer does not stay locked down with the trigger pulled and cycling the action. So it seems it is probably an issue with the trigger assembly fitting the stock.
Thanks, good call!
Click to expand...

I thought that might have been it. You're welcome. Do you see the post on how to fix it?
 
Jahkazz said:
Odd Shot........if this is what you are referencing:

Firstly, ensure it is unloaded, pull the charging handle to the rear and release. The hammer should be locked to the rear. Place the safety on, and try to pull the trigger. You should not be able to make the hammer release despite moderate pressure. Now take the rifle off safe, pull the trigger...the hammer should be released and make contact with the bolt. Now keeping the trigger pulled to the rear, while pulling the chargin handle to the rear and release...keeping the trigger pulled to the rear and hold. The hammer should be caught by the sear and be locked to the rear. Fire the action, keep the trigger to the rear and cycle the action 4 or 5 times again. The hammer should be engaged by the sear initially and remain locked down. Now with the hammer fully back and engaged by the sear....slowly release the trigger, the hammer should come off the sear and be engaged by the trigger. Pull the trigger and the action should fire.

It does not pass the second part, the hammer does not stay locked down with the trigger pulled and cycling the action. So it seems it is probably an issue with the trigger assembly fitting the stock.
Thanks, good call!
Click to expand...
Or as in my case it could be a badly woren hammer spring shroud. I had doubling and trippling with my M305 until it was replaced by a GI part. Seems the metal was too soft. My EBR Sage also failed the hammer following test until this descrepancy was fixed. All is good now, have about 200 rounds since the fix and not one double. Others have suggested that it could also be a stacking error.
 
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