Thanks for all of the info agksimon!
I realize this thread is over a year old, but I will be putting a Drop In Barrel in my M&P Pro next week. It's cold in Michigan, but I love shooting and ringing metal. So much fun, especially at 25 yards.
Thanks for the heads up on the - "I found that dry erase marker worked better for me, than Dykem, as it doesn't dry in place and shows a mark better."
I'll try the dry erase marker first, and if it doesn't work; then the Blue Dykem. I never really liked that stuff in all the years I worked as a Mechanic/Welder/Machinist. I works, but the smell always gave me a headache!
BTW - My 9mm Pro is not as loose as yours before you replaced the barrel. But I love making the gun better. That Apex Forward Set Sear and Flat Faced Trigger were perfect for me.
Take care, Thanks again for the info. :-)
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