"Drive the trigger into place between the sear/catch arm tabs. Do not worry about the tabs breaking off!"
That's from the installation instructions for the Can West trigger. I wouldn't worry about breaking the tabs off, either---what's a little sheared off steel between friends?
I would worry about rapidly running a cock-on-closing bolt into a finely adjusted sear engagement. (As in Dayton-Traister vs. M 96 Mauser.)
The Can West guys are not kidding about needing a gunsmith to install their trigger, either. There is some real serious understatement in the installation instructions.
The other guy wants to sell you an expensive "match grade" replacement trigger of standard L-E type (with Teflon!) which does nothing about the sear engagement of the regular military parts.
Don't sweat it, though, your disappointment won't stick to the Teflon.
-----krinko