Gunsmithing Which trigger for 1917 Remington?

Lank

Private
Full Member
Minuteman
Oct 20, 2008
11
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55
Wyoming, USA
Wanting to replace the original trigger in the Remington 1917 for a rebuild. Don't understand the difference between the '5 round' Timney, and the '6 round' Timney. Can somebody point me in the right direction?