HI Alvin,
They actually were originally blued on the muzzle as well, but the Military versions of these pistols and were issued and carried in a holster, the friction and rubbing of which polished the muzzle white over time, since that is were the weight of pistol rested. One does see commercial models from time to time with intact bluing on the muzzle.
That's my understanding anyway.
Vince
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