I have installed two Timney 788 triggers on 2 different 581’s. They both required minor wood removal for safety travel, minor bending of safety (torch, vice and factory safety as template), very minor removal of the top of bolt release to allow proper bolt release, and minor removal of the safety slot on the trigger ( to allow the bolt release to be further depressed). I inletted bottom metal on both so I had to remove some metal from bottom metal where the trigger group was making contact (probably would not do that again). Added second action screw and pillars with devcon bedding. Both shoot better than before mods. Timney Trigger is massive upgrade from stock non-adjustable. That said I have the 541 adjustable trigger in a volker customized 541x and it breaks at 8 ounces. If you can find that unicorn trigger, buy it at any cost!
