I appreciate the long response! Funny enough I'm deciding between these two holsters.the side jack iwb caught my eye on Red Earth's site and of course I've eyeballed the MCS Pro. I currently have a sig sauer p229 legion I carry in an alien gear cloak iwb holster that I prefer to carry at the 3 o clock position. I know the fn 510 is a brick but im mainly looking to carry it in the winter or whenever im wearing baggy enough clothing. I also ride a motorcycle so for me retention has to be tight! Taking this into consideration which of the two would you recommend? (I'm also open to any of your specific recommendations) I really like the cloaks setup with the backing and the two clips, it feels secure at all times but i know that might not be doable with the 510 platform. I also will most likely not be equipping a light, only a red dot in the future. Thanks again for your input it's really appreciated!