Table: ar15_variants
Columns: colt_model_no
name
stock
fire_control
rear_sight
forward_assist
case_deflector
barrel_length
barrel_profile
barrel_twist
hand_guards
bayonet_lug
muzzle_device

Question: what are all the barrel lengths whith the name  ar-15a3 competition hbar
SQL: SELECT "barrel_length" FROM ar15_variants WHERE "name" = 'AR-15A3 Competition HBAR'

Question: What is the fire control for the sporter target
SQL: SELECT "fire_control" FROM ar15_variants WHERE "name" = 'Sporter Target'