[oldfrank]

I always considered my self a pretty good amateur gunsmith and with 40 years as an airplane mechanic,fairly handy but this 301 is kicking my butt.
I was trying to lighten or smooth the trigger but of course you can't see anything until you take out the trigger assy and two parts came out and I am clueless on them.
I have searched everywhere for a parts diagram with no luck.
Anyone know where a parts diagram is or have one apart that knows where parts go back?
I have never taken a bag of gun parts to a gunsmith and I am not there yet but getting close.

 

[Soren13]

Take the whole thing apart by driving out the knurled pins in the receiver. Pretty hard but nothing to damage with a good punch set. You can get to the trigger and file slightly on the sear or trigger interface. Could be a bur or rough spot. Spring? I would be lost there.
Make sure to use white grease or synthetic brake grease on transfer bar while you're in there. Just my .02c. I've had mine apart at the outset. Plan on an hour or two. Lube hinge well with grease also. I can't find a diagram either but you won't need it: it's not very complex. It's a well made Chinese gun by Sun Machinery, Hong Kong?