If you want to get rid of the Marlin crossbolt safety, you can order a blank
crossbolt (that fills the hole) from:
Clyde Ludwig
P.O. Box 26156
Wauwatosa, WI 53226-0156
ph (414)536-1101
The price is $9.95 plus $3.00 S&H.
I just installed one on a 1894PG and it looks and fits great.