Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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 )

### Question ###
Which Hand guards has a Barrel profile of a2 and a Rear sight of weaver?

### Accurate SQL ###

SELECT "Hand guards" FROM table_80143 WHERE "Barrel profile" = 'a2' AND "Rear sight" = 'weaver'