Springfield Armory M1A Rifle Muzzle Break fit on m305 ??

No it doesn't, the Norinco is metric, and the SA is imperial, you will screw up the threads on the barrel, and then you're pooched
 
Yes, the brake will go on no trouble.

Now....getting the old Norc brake OFF......that's another story....mine was tack welded on from factory.
 
No it doesn't, the Norinco is metric, and the SA is imperial, you will screw up the threads on the barrel, and then you're pooched

Tried the castle nut again after reading your post. Both my chinese caslte nut, and the SA castle nut both thread on the barrel exactly the same with no resistance. 50Calshooter had the same experience with his SA castle nut as described on this thread:

http://www.canadiangunnutz.com/forum/showthread.php?t=667270&highlight=project+complete
 
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