CREATE TABLE table_26967904_1 (chambering VARCHAR(255), f_bolt VARCHAR(255), p_max___bar__ VARCHAR(255))
With what type of chambering is the F bolt n (lbf) and the P max (bar) 3900?
    
SQL: SELECT chambering FROM table_26967904_1 WHERE f_bolt = "N (lbf)" AND p_max___bar__ = 3900