The silver GaugeMates also are split full length. I recently bought a set of the silver GM's to use 12 ga. shells in my 10 ga. hammer Daly. I ground off enough lip to allow the extraction of the hull without having to remove the entire unit each time. Works great, but it's not for an ejector gun.
JR


Be strong, be of good courage.
God bless America, long live the Republic.