New M305s binding operating rod and misaglined rod guide and piston - Help?
- Thread starter DarceMegarce
- Start date
DarceMegarce
Regular
- Location
- Chatham-Kent
Update:
Finally got my M305 running like top. No failures to cycle since I discovered the problem.
The fix: over-indexing the barrel.
The problem: My theory is that Norinco over-torques their barrels to make it difficult enough to remove to satisfy some importation law requiring non-removable barrels. So, in order to have properly aligned gas cylinders they make them to sit canted slightly to the 7 o'clock position to align properly on over indexed barrels. I believe this because both of my Norc gas cylinders were misaligned (at 7 o'clock) on my neutrally indexed barrel. I removed the barrel, relieved material between the receiver and shoulder until I could over-index the barrel. Now, since my barrel has been over indexed I haven't had a single failure with my original Norc gas cylinder.
So, something to consider; with these Norcs it's more important to have a properly aligned gas cylinder then a neutrally indexed front sight. If the gas cylinders are as canted as mine both are, you can't have both the cylinder and front sight neutrally indexed. A neutrally indexed gas cylinder is critical to allowing the rifle to cycle, and the front site alignment comes 2nd to this.
Conclusion: Neutrally indexed front sights on 2013 Norc M305 is possibly a bad situation, if the gas cylinder is not neutrally indexed as well (likely not the case out of the box). An 11 o'clock front sight indexing = flawless cycling.
Finally got my M305 running like top. No failures to cycle since I discovered the problem.
The fix: over-indexing the barrel.
The problem: My theory is that Norinco over-torques their barrels to make it difficult enough to remove to satisfy some importation law requiring non-removable barrels. So, in order to have properly aligned gas cylinders they make them to sit canted slightly to the 7 o'clock position to align properly on over indexed barrels. I believe this because both of my Norc gas cylinders were misaligned (at 7 o'clock) on my neutrally indexed barrel. I removed the barrel, relieved material between the receiver and shoulder until I could over-index the barrel. Now, since my barrel has been over indexed I haven't had a single failure with my original Norc gas cylinder.
So, something to consider; with these Norcs it's more important to have a properly aligned gas cylinder then a neutrally indexed front sight. If the gas cylinders are as canted as mine both are, you can't have both the cylinder and front sight neutrally indexed. A neutrally indexed gas cylinder is critical to allowing the rifle to cycle, and the front site alignment comes 2nd to this.
Conclusion: Neutrally indexed front sights on 2013 Norc M305 is possibly a bad situation, if the gas cylinder is not neutrally indexed as well (likely not the case out of the box). An 11 o'clock front sight indexing = flawless cycling.
TacticalTeacher
CGN Ultra frequent flyer
- Location
- Georgian Bay, ON
Glad all is well. This thread serves as a good learning tool. Welcome to Norinco quality control where all bets are off. Lately I've been upgrading some cgnutter's rifles with Springfield Armory parts and I have found all their parts to be consistent. It's refreshing to work with consistent fitting parts once again. 
I'm grateful that their parts are available unlike Norinco parts that are scarce and have sharp edges to hurt my soft teacher hands.
Cheers and keep helping them noobies
Barney
I'm grateful that their parts are available unlike Norinco parts that are scarce and have sharp edges to hurt my soft teacher hands.
Cheers and keep helping them noobies
Barney
DarceMegarce
Regular
- Location
- Chatham-Kent
Thanks again Barney and everyone else who helped me along the way to fix my M305. Took me several months and more then a few times I gave up for a while but I knew this rifle would be a shooter and eventually I fell on the solution through good old trial and error. I figured it's a good idea to update you guys in case another M305 newbie comes around with a similar issue and this thread can help them work theirs out too. This rifle has been pure joy since I got the fitting of everything just right. Worth the wait and now I need to see what she can really do!
Next step is a mount/scope project. Irons still work well enough for 100m but I have a feeling this rifle can really reach out...
Next step is a mount/scope project. Irons still work well enough for 100m but I have a feeling this rifle can really reach out...
