what does the MKIISD update mean?<br /><br />the main update and why these are called MKIISD are that I took some improvements from the FGC9 SD and placed in the MKII shroud models that I designed. but keep in mind the are still made to just work with the MKII this is because the rail stands higher then the SD does.<br /><br />so the magnet design of the MKII have been removed. and the SD style magnet have been added. the to install it is basically the same. but you will be using a cylindrical magnet with a OD of 5mm and 10mm long in size.<br /><br />and wile I’m add it did I also add the grove that prevents the barrel from rotating<br /><br />--<br /><br />this new 2022 series will have the option of a bolt on top rail. (yes, I have gotten those requests over the years)<br />but the real reason I made it's that this shroud will soon also have a lower rail option. that is made possible by using different M3 bolts.<br />but more on that later<br /><br />the fixed low rail version of the MKII and UNW low rail have been added as well