I don't have any experience with it, yet. I only have two Smiths with the IL, both 500s. I'm glad this thread was started, reminding me to order two of The Plugs soon, as I understand that all those pesky internal lock flags and miscellaneous parts may accidentally fall out of the revolvers while they are in the safe, and I just can't stand ugly holes in the side of the frame which could allow all kinds of dust, dirt, twigs, marbles, peanuts, bubble gum and other flotsam and jetsam to enter the "inner sanctum" of my guns.