old FX Axsor air leak - best repair sites ?

Hello,

My FX Logun Axsor (bought in 2005) has an air near the trigger guard area. It is audible when filling from a SCBA bottle.

There are many options for repair (FX, Pyramid, etc.) Does anyone have a better recommendation?

Thanks
I just received back, an FX Tarantula bought new 20+ years ago from AOA, that needed reseal and tuning. 910 Airgun Tuning and Repair performed both tasks admirably. I’m certain they can help you. John