m305 op-rod spring guide popping out of tracks when manually cycling the action

[Mister Donut]

No worries

I should add tho... It doesn't take much to shave down the GI pin diameter.
I usually chuck 1/8" of the GI pin on the drill, that 1/8" can stay full diameter. Just make sure you put the end that normally sticks out of the receiver, into the chuck
Those GI pins can be quite hard so a good file or even better a medium coarse flat stone also works extremely well.
A guy could also get away with using good sand paper stuck to a hard object but this may take a while.
As with all things DIY, take yer time and trial fit as you go.

It might be worth giving it a try actually. Is it hard to get the Norc connector out? I understand the little retaining pin is super-loctited in or something, and just a little heat will loosen it up?

 

[45ACPKING]

If I'm not planning to reuse the norinco pin, I don't try and pull the retainer if it refuses to budge with a pull via a pair of vice grips.... Instead, I use a 1/8 punch and just give it a good driving from the opposite side. The connector pin comes out, easily shearing off that pesky retaining pin..... Hillbilly... Yes I know, but I get points for not involving a dremel tool ?