Well done Greg, your quick access to applicable photo's amazes me. Excellent.
At first while depressing that pin you might have to pry carefully on the back plate, they can be snug and need some persuading.
After being removed once or twice they usually are easier to get off. I don't take mine off very often.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."