Great info!

The 3” versions were more for the S/A’s, MEO’s, AIO’s and Pilots. However they did have the option of carrying a 4”. The 4” CS-1’s were more the CPO’s and Inspectors.
The US Border Patrol also extensively carried the 686 but I think they were more like production guns versions a specific order like the CS-1. The Border Patrol did have a special run of 3” GP-100’s instead of 3” 686’s.

Both Customs and Border Patrol have had specific firearms for each agency but none have had a following of the CS-1.

The “new” specific “Customs” Gun is a Glock called the G47. Try finding that one!!!!!

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USMC Retired, Gun aficionado..