tanfoglio1911 Posted March 9, 2017 Share Posted March 9, 2017 I want to ask this question to the guys shooting open 9 major. I will put a new upper to my open gun, changing from 40 to 9 and want to know what MSH weight do you normally use . Thanks. Link to comment Share on other sites More sharing options...
jcc7x7 Posted March 9, 2017 Share Posted March 9, 2017 Not sure what you're asking but here goes. MS wgt. 17lbs Steel MSH in plastic grip cause I like the grip better than the steel ones I've tried BAM magwell Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 9, 2017 Share Posted March 9, 2017 3 hours ago, tanfoglio1911 said: what MSH weight do you normally use ? I've been shooting 9mm Major in OPEN for ten years - not sure what MSH weight is ... ??? Link to comment Share on other sites More sharing options...
tanfoglio1911 Posted March 9, 2017 Author Share Posted March 9, 2017 I am refering to the apring weight of the main spring housingSent from my SAMSUNG-SM-N920A using Tapatalk Link to comment Share on other sites More sharing options...
Aircooled6racer Posted March 9, 2017 Share Posted March 9, 2017 Hello: 17lb ISMI in both. 8-10lb ISMI recoil spring for 9mm depending on load and personal preference. Thanks, Eric Link to comment Share on other sites More sharing options...
tanfoglio1911 Posted March 9, 2017 Author Share Posted March 9, 2017 43 minutes ago, Aircooled6racer said: Hello: 17lb ISMI in both. 8-10lb ISMI recoil spring for 9mm depending on load and personal preference. Thanks, Eric Thanks. I used 9 lbs on my 40 open but might try it first before going down to 8 lbs to my new 9mm upper. Link to comment Share on other sites More sharing options...
zzt Posted March 10, 2017 Share Posted March 10, 2017 With a SS firing pin, I won't go lower than 17 lb for a mainspring. With a Ti firing pin, you will have to go higher. Going heavier for insurance does not change trigger pull that much. For example, one pistol had a 16-17lb MS and worked perfectly until I put a 22 conversion on it. Then I had 20% FtF issues. I replaced the 16-17 with a 19 and the problem disappeared. Trigger pull before the switch was exactly 2.5 lbs.; after it was 2.62. A minor adjustment to the sear spring and it would be back to 2.5. Link to comment Share on other sites More sharing options...
tanfoglio1911 Posted March 10, 2017 Author Share Posted March 10, 2017 2 hours ago, zzt said: With a SS firing pin, I won't go lower than 17 lb for a mainspring. With a Ti firing pin, you will have to go higher. Going heavier for insurance does not change trigger pull that much. For example, one pistol had a 16-17lb MS and worked perfectly until I put a 22 conversion on it. Then I had 20% FtF issues. I replaced the 16-17 with a 19 and the problem disappeared. Trigger pull before the switch was exactly 2.5 lbs.; after it was 2.62. A minor adjustment to the sear spring and it would be back to 2.5. I am not sure yet if the gunsmith will put Ti of SS firing pin, but I will take note of this. Thanks a lot. Link to comment Share on other sites More sharing options...
BeerBaron Posted March 13, 2017 Share Posted March 13, 2017 Just a tip - MSH stands for main spring housing which is just the physical housing that holds the spring etc. people call the spring the main spring (MS) or hammer spring. Link to comment Share on other sites More sharing options...
tanfoglio1911 Posted March 13, 2017 Author Share Posted March 13, 2017 Just a tip - MSH stands for main spring housing which is just the physical housing that holds the spring etc. people call the spring the main spring (MS) or hammer spring. ThanksSent from my SAMSUNG-SM-N920A using Tapatalk Link to comment Share on other sites More sharing options...
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