CREATE TABLE table_80143 ("Colt model no." TEXT, "Diemaco model" 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)

Which Hand guards has a Barrel profile of a2 and a Rear sight of weaver?
SELECT "Hand guards" FROM table_80143 WHERE "Barrel profile" = 'a2' AND "Rear sight" = 'weaver'
SELECT "Hand guards" FROM "table_80143" WHERE "Barrel profile" = 'a2' AND "Rear sight" = 'weaver'