Fifty seven inches”. So I took a caliber to my BCGs and all calculated 1.57 inches. So I received to thinking of that and made a decision to file down the trigger lock bar ever so marginally. Now I'm able to put the gun with each other! I did drill https://knoxxsmev.vigilwiki.com/7076473/helping_the_others_realize_the_advantages_of_rare_breed_frt_trigger