greatmodels.com lists had a few, but there are never many, if any, items in stock. Depending on what you are looking for, try Eduard for barrels. The Barrel Store has different kinds, too. But they seem pricey. Depends on what you're looking for and what kind of bucks you're willing to lay down.
Bill
==========================================================
DML M4A2 Red Army
==========================================================
==========================================================
-- There is a fine line between "hobby" and "mental illness". (Author unknown)