Measuring is easy...
Degrease and de-oil the surfaces with alcohol.
Then use a good black magic marker to color the engagement surface of the sear, and / or firing pin. Assemble and dry fire a few times. Then disassemble and measure the depth of engagement by checking to see how much marker has been scratched on each piece by the two surfaces rubbing together.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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