Help me love my m305.

the trigger housing is under tension when locked into the stock and the receiver (from the trigger guard locking in).

I suspect that something is a little out of spec and causes the safety to not fully engage once the trigger assembly is locked into the rifle.

Another CGNer wrote up how he fixed his with a little filing of the safety where it was binding on the hammer.
 
What part of the country are you located?
There appears to be a possibility of a number of issues you may be dealing with.

Is the action propperly lubricated?
Is your op rod guide loose and moving on the barrel? There are directions on the Internet to correct this by peening the barrel mating surface.
As for rounds hanging up on your scope mount, try changing out the ejector and spring for a GI one. This generally fixes that issue.
 
Sask.

Everything is greasy and oily.

The op rod guide has play in it, took the op road out and the guide wiggles.
 
Peening the op rod guide may help keep the alignment in place, although it isn't terrible to begin with. Everything looks well and greasy, so I wouldn't worry about that. Try looking up fixes for the function/safety test failures. I am not knowledgeable enough on the finer workings of the trigger group to be of much more help, so I apologize. Someone will be able to figure it out for you.
 
If I understand correctly, odd shot, it appears to pass but I'm struggling with the concept. This could be the blind leading the blind now.
 
Function test of assembled rifle:


Rack the action. Hammer should be back (cocked).
Operate the safety to "ON" position. It should engage positively.
Pull the trigger. Nothing should happen because the safety is engaged.

Turn safety off (push the tab forward).
Pull the trigger and hold. The hammer should release and strike the bolt/firing pin.

Keep holding the trigger with one hand and rack the action again with the other.
The hammer should #### and stay cocked (while you're holding the trigger).

Release the trigger. You should hear a light click or clunk but the hammer should stay cocked.

Pull the trigger again and the hammer should release.

Aside from the safety, if everything else works as described, you don't have a trigger assembly fit issue. If that is the case, I would suspect that your op rod is binding somewhere within the stock.

A loose op rod guide a bad for accuracy, but shouldn't cause the binding you're describing. If it is out of alignment, then it may cause binding.

And it doesn't hurt to add: there should be absolutely no lubricant on the piston or the inside of the gas cylinder.
 
Last edited:
OK, so it does not pass the second test.

Holding the trigger the hammer kicks as the action is released.

The first part of the test, I can cause the safety to release by playing with the trigger (trying to depress is about 4 times with the safety on, you can see the safety move forward a bit each time until it is no longer safetied)
 
So it appears that my trigger issue is due to the stocks. I stumbled apon the fellow who put the trigger and receiver together out of the stock and gave it a try and voila. So it appears I need to file down my stock a bit.

Update on the op-rod, I took the piston out and low-and behold I stick have the issue where the bolt doesn't close all the way, so now I haven't a clue what's causing the jamming.
 
Tires said:
So it appears that my trigger issue is due to the stocks. I stumbled apon the fellow who put the trigger and receiver together out of the stock and gave it a try and voila. So it appears I need to file down my stock a bit.

Update on the op-rod, I took the piston out and low-and behold I stick have the issue where the bolt doesn't close all the way, so now I haven't a clue what's causing the jamming.
Click to expand...

Tires said:
Yes Odd shot I put it together without the stock and it functions fine.
Click to expand...

Sorry, I was referring to the op rod sticking. Does it still stick when not installed in the stock?

Did you try the tilt test demonstrated by TonyBen in the last youtube vid?
 
Last edited:
So far that I know it doesn't stick when out of the stock.

Got the USGI stock grinded down for the trigger group. Works like a charm and passes the tests now. Thank you, I would never have figured that out on my own. I'm hoping that that will sort out the failure to fire. I plan on taking it for a test drive tomorrow to see how it does now. The op rod sticking was a small issue so I'm curious to know how problematic it will be now if the trigger is sorted out.
 
If the op rod does not stick when the barrel and receiver are out of the stock, the op rod is binding up on the stock somewhere. Try using some white crayon inside the stock where there barrel and op rod go and see if the op rod is scuffing on anything.
 
Doesn't seem to be the stock.

The action is significantly harder to operate when the magazine is in the well. Not sure if that's part of it.

Put a mag worth of rounds to it today. Went pretty well, first rounds brass got caught in the bolt even though there is no rail on it right now, I think I have to look into the USGI ejector. The other 4 rounds went off like clockwork.
 
You must log in or register to reply here.
Back
Top Bottom