I had a similar problem with a new G2C that I got last February.
When I broke it down I noticed that the outside of the barrel was a little rough, and not as polished as my PT-111 G2.
I took some Rubbing Compound, and rubbed it down as best as I could. Especially near the front where it flairs out and slips into the front of the slide.
Also, use a little Gun Grease in that area too.
Let me know if that helps. It worked for me.