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Posted: 7/10/2012 1:30:34 PM EDT
| just recently got two troy ambi saftey selectors that I'm going to install soon. my question is about the contact or engagement surfaces between the rear trigger arm and the saftey selector surface,, will the after market selectors match up with the stock triggers with about the same amount of play? or will I have to fit new triggers also? |
The selector center's flat section diameter on Troy's measures 0.327, and it's pretty consistent. Cast selectors can vary from 0.325 to 0.335. The amount of play isn't as important to us (Battle Arms Dev.), ours is 0.330, the width of the center flat section, however, is. Triggers with wide rear extension are more demanding of the receivers being in spec, we made ours as wide as possible to accommodate slightly out of spec receivers when such triggers, like Geissele National Match series triggers, are in use.
You should not have problem with Troy selectors 
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We ourselves have had a few PIPs (product improvement program) with increasingly tolerant dimensions to forestall tolerance stacking issues. The latest changes include reworked detent hole diameter and angles, and reworked detent shoulder and groove depth and angles, to ensure an even more positive detent engagement.
Cast selectors have "standard" dimensions insofar they are semi auto, can't be rotated past FIRE / SEMI, and lack the cams, sear cut and other intricate grooves/flats on a select fire selector. The selector center lengths vary a little, the detent holes and groove definitely vary from different manufacturers, thus you can grab a dozen of cast selectors, install them on a single receiver, with the same trigger, and they will exhibit perceptible different feels to them, some may be perfect, while some gritty, too tight, too mushy, etc. The detent, pistol grip, and receivers all have their part in the characteristics of a selector. Troy's selectors have been pretty consistent, the only changes I can discern is the shape and serrations on the levers. The latest have less wobble on the levers when they've been installed on the selector center
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