Question: What is the value of barrel twist when the barrel profile is SFW?
SQL: SELECT "Barrel twist" FROM "1-12834315-8" WHERE "Barrel profile" = 'SFW';

Question: What kind of hand guards are associated with a rear sight of A1 and stock of A2?
SQL: SELECT "Hand guards" FROM "1-12834315-8" WHERE "Rear sight" = 'A1' AND "Stock" = 'A2';

Question: How many inches is the barrel length when the rear sight is Weaver and the barrel profile is A2?
SQL: SELECT "Barrel length" FROM "1-12834315-8" WHERE "Rear sight" = 'Weaver' AND "Barrel profile" = 'A2';