CREATE TABLE table_68819 ("Colt model no." TEXT, "Stock" TEXT, "Fire control" TEXT, "Rear sight" TEXT, "Forward assist" TEXT, "Barrel length" TEXT, "Barrel profile" TEXT, "Barrel twist" TEXT, "Hand guards" TEXT, "Bayonet Lug" TEXT, "Muzzle device" TEXT)

Can you tell me the Barrel twist that has the Barrel lenght of 11.5 in.?
SELECT "Barrel twist" FROM table_68819 WHERE "Barrel length" = '11.5 in.'
SELECT "Barrel twist" FROM "table_68819" WHERE "Barrel length" = '11.5 in.'