Senco BF0204 Piston Retainer Fpr600/650

Does this fit my model?
Does this fit my model?
Senco BF0204 Piston Retainer Fpr600/650
MODEL: BF0204
Bundle Total: $4.99
Piston Retainer Fpr600/650
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of those chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically-treated lumber. Click Here for more information
Only place I could find this part-got my framing gun going strong again !!