human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Colt model no., Diemaco model, Stock, Fire control, Rear sight, Forward assist, Barrel length, Barrel profile, Barrel twist, Hand guards, Bayonet Lug, Muzzle device
###Question: Which Hand guards has a Barrel profile of a2 and a Rear sight of weaver?
gpt
SELECT Hand guards FROM table WHERE Barrel profile = a2 AND Rear sight = weaver