Sear bar

[Vlim]

Hi,

I trust you mean part 18, the sear bar?
You can create a bit more space between the side plate and the sear bar by either removing some material from the edge of the side plate or by slightly enlarging the pivot hole in the sear bar.
I heard that slightly bending the sear bar can also help.

But I'm no gun smith, so someone else should say what the best and safest option is.