Sig Sauer P320 Barrel, 9mm Compact, mikucosplay.com DLC. Bar-Sto Barrels for Sig P320 X5. Double Diamond Sig P320 Standard Replacement Barrels. I’ll have to find some quicker ideas for those Game of Throne Khal Drogo fans who don’t want to spend that much time making a Halloween costume! NOTE: I have been very careful to exclude anything that could reasonably be considered a spoiler from this season, however there may be a few minor spoilers from some of the show’s earlier seasons, proceed at your own risk.