[Larry the Gun Guy]

I have occasionally had this problem and I have solved it by having the gun with the barrels on it standing up on its butt. Then I put the forend tightly against the barrels and forcefully start pushing it down toward the receiver. It takes some strength to do this, but it recocks the ejectors and the forend will then latch onto the barrels. It's kind of like the dowel method but using the gun to do it instead of the dowel.