Since the stock trigger for my Tavor is extremely heavy, I’ve been keeping an eye on the various companies developing after-market triggers. The first of these to ship is made by Timney Triggers, so I gave it a try. Unfortunately, it was so unreliable as to be useless–I experienced many failures to fire due to light primer strikes. With M855 ammo I got light primer strikes about 25% of the time, and with Black Hills match ammo (with softer commercial primers) I had one per 30-round magazine. Needless to say, I don’t recommend this product. Timney did honor their return policy and gave me a full refund after I shipped the defective trigger back.
There is a user modification to the factory trigger described in detail on the Military Arms Channel blog. It’s easy enough to do, but since it involves removing two very small parts which I would almost certainly never see again, I’ve been holding off until such time as IWI starts selling spare parts.