Let's see if this works:
Here's a photo of my 457 MTR with the Area 419 bolt knob installed:
CZ 457 Varmint MTR at the Home range
Here's a view showing the knob (again on the 457)-which is the same knob I have on the 527 MTR:
Rear View
Top View
Here's a view of the 527 MTR (6.5 Grendel) with the knob on that gun (gotta look closely to see the knob):
CZ 527 Varmint MTR at the Home Range
Here's a photo of my 457 MTR with the Area 419 bolt knob installed:
CZ 457 Varmint MTR at the Home range
Here's a view showing the knob (again on the 457)-which is the same knob I have on the 527 MTR:
Rear View
Top View
Here's a view of the 527 MTR (6.5 Grendel) with the knob on that gun (gotta look closely to see the knob):
CZ 527 Varmint MTR at the Home Range