Craftsman 20V 21 Degree Round Head Framing Nailer

I have a Craftsman 20V 21 Degree Round Head Framing Nailer in working order. The spring on the mag broke loose but the nailer still works. Its a good project nailer if youre willing to hold pressure on the mag or if you want to get the part and fix it yourself. Can demo if you want to see it work. Asking $50.00retail is $300, thanks for looking.