If your pistol has a firing pin stop that has had the top of it shortened to accomodate a certain sight, we can supply a new firing pin stop shortened to your dimensions. Just measure your old FPS from the top of the firing pin port to the top of the FPS with an accurate caliper and record it. Order the FPS that is correct for your pistol as well as adding this option. Place your order and once you have your order number, send me an email to john@HarrisonCustom.com referencing the order number and giving the dimension you measured. I'll shorten your FPS to your dimension and send it to you within a couple of days.