Your right they are built stout and you would have to shoot a heck of a lot of ammo (I would think) to cause any damage to the receiver, but then again the receiver is the registered part and I want mine to be around a long time. You can feel the difference in the rearward slam of the bolt, it is much softer.
I also remembered reading about a few others that lightened their bolts to get a higher rate of fire, sounded like a job for a good machine shop though, the steel in the bolt is very hard.
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