If you are making a Stingray with an AR-9 barrel, the upper from FGCKits is for the original FGC-9, not the stingray. Included in my upload is a Stingray upper modded to accommodate an AR-9 barrel. I modded FGCKits' handguard because the AR-9 barrel I bought was too wide to fit. So if that happens to you, you can use the one included.