Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the P max (bar) of the pistol with a P1 diameter of 12.09 mm?

### Inputs:
table_name: table, columns: ['Chambering', 'P1 diameter (mm)', 'A external (cm 2 )', 'P max ( bar )', 'F bolt ( kgf )', 'F bolt']

### Response:
SELECT P max ( bar ) FROM table WHERE P1 diameter (mm) = 12.09