Gas Valve

L

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North of Edmonton
In my effort to help diagnose some of the inherent accuracy issues on my M305 I would like to shut off the gas system. I physically cannot depress the flat head screw enough for the roll pin on the other side to rotate. Is this a well known problem on these rifles? Should I file down the boss slightly to allow it to rotate out of its groove? Or is there something else I should be looking at?

Is there another method to disable the gas system without closing the valve, such as removing the piston?

Thanks!
 
The spring inside is too long
Mine had the same problem
Remove the roll pin - disassemble and shorten the spring
I like to grind them. Keeps the ends flat
Obviously, don't take off too much. Just enough for the roll pin to clear the groove on the other side.
 
As a main operating principle, you want to modify removeable parts before going after the permanent part(s). Keep in mind, 98% of M305 owners have no need to ever touch the gas cutoff. So it is no wonder a long spring got past QA/QC, and any subsequent inspections or customer returns.
 
Leave it alone and don't waste your time otherwise our shooting team would have done that operation over 25 years ago. Save your energy and buy some practice ammo.

Have you greased up your rifle?
Tightened up your gas system?
Inspected your op rod guide for lateral play/slop?

All kinds of tweaks to carry out. And after all is said and tweaked, a box stock Colt HBAR or almost any AR15 will outshoot your M14/ M305 / M1A....

Save your money!

Buy a dedicated Precision Rifle and scope it and have fun with shooting small groups. Better yet, I know a few shooters in the ORA circles who shot my matches (I was the 2014 PR Match director) with a Remmy M700 SPS .223 and kicked ass with it out to 800 yards on Mons Range!

Hope this helps the addiction! :)

Barney
 
Wow, didn't realise people were replying to this thread.

I took another look at it. My scope rings were loose. The entire scope slid forward, and I couldn't adjust the magnification as it was right up against the ring. The screws were loose. I'm thinking some blue lock tite might be in order. The CASM mount itself was fine, just the rings. I'm using grand slams, I might need to get a better ring as well.

Things I know that are wrong with the rifle, the barrel isn't indexed properly, and possibly other things. I've spoken with a fellow from Regina and may get him to look at the rifle, m14medic. I'm not after pinpoint accuracy, but a consistent 2 to 2.5 MOA is what I'd be after.

I'm a savage fan boy and have been considering a 10TR or a 10 FCP-SR. I know the m305 will never perform as well as one of these, well, not on the budget I'm specifying.

Thanks!
 
Check the oprod guide to make sure its strait and has no play, that can make a huge difference( If there is play puch out the roll pin and peen the splines and reinstall with loctite). Bust off the flash hider and take the gas system apart and make sure its nice and snug when all put together, if not peen the splines and tighten it back up. After that make sure the gas lock tightens up at 5 o'clock and you just tap into place at 6 o'clock. If this doesn't work the try flippin the gas lock 180 degree's nd see if that helps. If that doesn't work see if you can swap gas locks with a few other fellow owners, this will usually help ya and if not then shims are needed. These are all cheap fixes that can help wring a bit of accuracy out of your Norc.
 
There isn't any play in the op rod guide, and the gas system is tight with the dlask gas lock.

I'm going to see how it is with the scope actually tight and lock tited in place without touching the gas valve. I can't believe I missed the scope rings on my first examination. Oh well, live and learn I guess.

I'm using Hornady 155gr BTHP American Gunner ammo. Likely not the best, and i'll grab some federal blue box to give a try with as well.
 
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