The LCS has two shroud sizes, 11in and 13in. Please measure and select the correct option in the drop down selection.
https://donnyfl.com/products/lcs-sk19-1-2-x-20-adapter-a57?_pos=1&_sid=185f40e12&_ss=r
I recommend the Ronin .30 for the LCS to reduce pellet clipping.