I am not greatly familiar with this particular rifle, but please consider the following to see if it may apply. I bought a CVA double shotgun a while back. The locks each had a fly installed, even though no one in their right mind would ever use a set trigger on this gun. In preparing this gun for my grandson (it had never been fired) I found the unnecessary flys were so poorly designed and made that the gun could be cocked with the sear resting not in the full or half cock notch, but on the fly. This is a dangerous condition where the gun can, (and will) fire unintentionally. If your rifle uses the same works inside the lock or similar ones, you should not make the set triggers operational, and should not reinstall the fly. A gunsmith and neighbor of mine had a CVA shotgun accidentally fire due to this issue while he was hunting with his son. I removed both flys from my shotgun, and recommend that you either do not use your rifle, or you install a single trigger, or disable the set feature of your set triggers. I bet this is why the manufacturer disabled the set triggers and removed the fly.