The best way I have found to cut the Pelican Case Foam is to lay everything out in all possible config that you might want, pick the best and then use a med point sharpie to trace around each weapon. Here is where it gets crazy sounding, find an old electric knife with the fixed and the reciprocating blade and it will cut perfectly straight lines. Just follow the pattern you have traced on the foam. I always try to go just a bit smaller and trim out any excess to make sure I have a tight fit. Good luck.