1.5 mill bbld receiver M1 Garand 006
Typical annealed 1.5 million receiver, as rebuilt about 1952, bearing an 8-51 SA barrel.
There is some indication the excessive hardness (brittleness) of the original heat treat process, effectively an anachronism and mistaken specification, was discovered when sight teeth ("Splines") began to fragment early. Again: I have no idea how important that was in the decision to re-heat treat. A few say the term "anneal" is not quite correct. Yet, the controlled cooling was done to stretch the hardness level, spread out the toughness, and make the metal more durable and less frangible--which is the PURPOSE of annealing.
Another source says receivers "split". It is likely BOTH are correct.
This is closeup of the area, and there is pre-treatment fragmentation visible on the bottom "teeth".
This one is exceptionally good in terms of condition.
Copyrighted, all rights reserved.
1.5 mill bbld receiver M1 Garand 006
Typical annealed 1.5 million receiver, as rebuilt about 1952, bearing an 8-51 SA barrel.
There is some indication the excessive hardness (brittleness) of the original heat treat process, effectively an anachronism and mistaken specification, was discovered when sight teeth ("Splines") began to fragment early. Again: I have no idea how important that was in the decision to re-heat treat. A few say the term "anneal" is not quite correct. Yet, the controlled cooling was done to stretch the hardness level, spread out the toughness, and make the metal more durable and less frangible--which is the PURPOSE of annealing.
Another source says receivers "split". It is likely BOTH are correct.
This is closeup of the area, and there is pre-treatment fragmentation visible on the bottom "teeth".
This one is exceptionally good in terms of condition.
Copyrighted, all rights reserved.