CREATE TABLE table_29167 ("Chambering" TEXT, "P1 diameter  ( mm ) " TEXT, "A external  ( cm 2  ) " TEXT, "P max  (  bar  ) " FLOAT, "F bolt  (  kgf  ) " FLOAT, "F bolt" TEXT)

What is the P max (bar) of the pistol with a P1 diameter of 12.09 mm?
SELECT "P max ( bar )" FROM table_29167 WHERE "P1 diameter (mm)" = '12.09'
SELECT "P max ( bar )" FROM "table_29167" WHERE "P1 diameter (mm)" = '12.09'