I'm looking at getting a Lonex M4 and having it internally suppressed. I will probably get the version without the RIS and then change it. My question is what kind of internal suppressor options are there. All I have seen is the Matrix conversion kit on Evike, and I'm leaning away from it cause it is Matrix. http://www.evike.com/product_info.php?cPath=25_86_267&products_id=27823 Also, can a regular silencer be placed in the Lonex RIS version instead?