Several years ago I purchased a .30 AN M2 Browning aircraft gun at auction that was listed as 'welded shut' but very good condition. I put an appropriately low postal bid and won the gun, and was very surprised (and pleased) to see that the 'weld' was hardened cosmolineicon. Kerosene and a hair dryer solved the problem and I now own a mint, unfired Savage .30 AN M2!