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Why did my SA go up?


BHogan
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Hello, first post ever after reading and learning a lot on this great forum. Sadly, I think my first post is destined to be kind of a dumb question, but I'm puzzled so asking! 

 

Anyway, I'm doing a few CGW upgrades on a base SP-01 with manual safety, including the short reset and reduced reach kits.  Just quickly did the slide parts tonight (extended pin and reduced power FP and block springs), and was curious what, if any effect that reduced FPB spring would have on pull.  Oddly it seemed to go up a pound, and I can't figure out any reason why! I was about right at 5 to maybe 5.5 bone stock, but now it's pulling around 6.5#.  Does that make any sense?  I did some very light polishing on the plunger and holes per the Atlas thread and the plunger movement seemed smooth as butter.  I'm not particularly worried but it seemed so weird, thought maybe there might be some interesting "aha" insight y'all could lend me? 

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Check the sear assembly, firing pin block lifter, and the sear cage pin to see if it’s moving freely.

My firing pin block lifter in my CGW Kit was half a hair too thick, and it had the hardest time fitting in the sear cage pin; and when you pulled the trigger, the block lifter stayed up. The parts in the sear cage shouldn’t be binding to that pin holding everything together.

Also, check the hammer strut for any burrs that might cause the hammer spring to bind.

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Thanks souperman. What's crazy is all I've done at this point is replace the firing pin, FP spring, and block spring.  Everything else is still bone stock.  Does the block plunger need much lubrication? I'm wondering if it's just too dry or something.  It probably nothing,  but I was really surprised to see the pull go in the other direction after step 1. Kind of an inauspicious start to this build 😅

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Thanks souperman. What's crazy is all I've done at this point is replace the firing pin, FP spring, and block spring.  Everything else is still bone stock.  Does the block plunger need much lubrication? I'm wondering if it's just too dry or something.  It probably nothing,  but I was really surprised to see the pull go in the other direction after step 1. Kind of an inauspicious start to this build [emoji28]


Did you replace the firing pin block lifter? Maybe I’m confusing parts, but I thought you had to do this if you replace the firing pin because of the extended length. The firing pin block lifter needs that additional extra time to lift to clear.

Maybe it’s old guidance, but I’ve remember piecemealing the parts when Cajun didn’t have a complete set ready to go :)
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Ah, I bet that's it.  I haven't done that part of the kit yet, I just took kind of a sneak peek pull after I did the slide stuff  because I wondered how much of a difference the plunger spring alone would make.  Maybe it's not clearing the firing pin right without the new lifter in yet or something

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