Without going and measuring the lightning cuts in my 0 frame 16(grade 2 with 26" barrels) I'm guessing the cut may be 1/2" wide by 2" long. That would amount to a tiny bit less than 2 ounces removed. (Steel is .284 pounds/cubic inch)
My gun balances just at the hinge pin, so I was wondering if the cuts were left out of the frames of 30" guns in order to keep the balance point at about the hinge pin also.
Imade an error in my math. So edited it, above. works out to 1.78 ounces
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