The Troy and Norgon both work well. I prefer to use the Norgon, but that is due to ergonomics. I have smaller hands so trying to use the Troy would cause me to break my grip more than I wanted to. With the Norgon I have no issues with reaching it with out breaking my grip.
If I recall correctly the Norgon will not work with a battery assist type lever but the Troy will. So if that is important to you then you will want to take that into consideration.
As for the Norgon being difficult to actuate, it is only on a full mag with the bolt closed. That is due to the spring pressure being exerted from the magazine. It may be the same with the Troy but I do not remember as I only used it for a very short time.
As for wear on the receiver, I would assume the Troy will eventually leave a wear mark on the lower. So if that bothers you, then I would avoid it and go with Norgon. If it is irrelevant, go with the whichever one fits your functionality, ergonomics, price, and cosmetic needs.
If you are also looking for other lefty friendly mods.
Ambi charging handles. Both are great handles, but if I needed to buy another one I would go with the BCM because of the price.
Rainier Arms Raptor
BCM GUNFIGHTER Mod A44
Ambi safety selectors
In my opinion
Battle Arms Development has the best thing out there, especially the short throw selector and interchable levers. But there are a lot more cheaper options out there.
Again, all of this stuff, even with grips, stocks and whatnot, comes down to functionality, ergonomics, price, personal preference, cosmetics and etc. Me personally, I will take functionality and ergonomics every single time but everyone's needs are different. By the time you have the rife to your liking, you will most likely end up with a box of trial and error parts.
