Spoke with T/C This morning and they have the Scout nipple in stock:
$13.75.
P/N 7231

Thompson/Center Arms Co., Inc.
P.O. Box 5002
Rochester, NH 03866

Our shipping address for repairs is:

Thompson/Center Arms
Farmington Rd
Rochester, NH 03867

Or you can call us at: 603-332-2333, or fax us at: 603-332-5133

Regards,

Tahquamenon