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  #1  
Old 02-16-2020, 10:29 PM
gnappi gnappi is offline
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Springfield ILS MSH surprise

Not knowing that Springfield deployed the ILS MHS, after re-converting my "Loaded" back to 9mm from .38 super I knew the mainspring which was double strong was needing a replacement.

Out of my parts bin came a lighter spare spring, and upon removal of the MSH, sproing out jumped the mainspring. Initially I thought the PO or whoever did the super work lost the cap retaining pin. Anyway after some angst I finally discovered the differences in the MSH and installation procedures and got it back together.

With that known, I wanted to keep the gun as a dual caliber I bought another MSH with captive spring and will convert this one so I could swap around calibers as needed.

Fair warning to Springfield owners who want to change main / trigger springs, safeties, hammers etc. :-)
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  #2  
Old 02-16-2020, 10:49 PM
megafiddle megafiddle is offline
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Good information, as the disassembly tool provided by Springfield for removal of the ILS mainspring housing is often lost, or not provided with used guns.

-
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  #3  
Old 02-16-2020, 10:57 PM
log man log man is offline
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...and the ILS mainspring is not compatible with the std spring cap, or vice versa. However using a std spring and a std spring cap with pin will work fine in the ILS housing.

LOG
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  #4  
Old 02-17-2020, 12:00 AM
emptymag emptymag is offline
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  #5  
Old 02-17-2020, 09:35 AM
jjfitch jjfitch is offline
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Why do you change MSH when changing calibers?

The retention pin isn't necessary for proper function. Helps with disassembly and reassembly though!

Smiles,
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  #6  
Old 02-17-2020, 09:52 PM
Jason D Jason D is offline
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Quote:
Originally Posted by jjfitch View Post
Why do you change MSH when changing calibers?


This.

You don't need to change the mainspring at all. It is true that the ILS had an over powered mainspring, but that was to negate the lightness of the titanium firing pin and over powered firing pin spring that could cause light primer strikes.
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  #7  
Old 02-18-2020, 04:23 AM
Rwehavinfunyet Rwehavinfunyet is offline
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1911 style guns and titanium firing pins.....

The advent of the titanium firing pin was marketed to say it produces faster "lock time." It probably is slightly faster since it has less mass, however, it is highly unlikely a pistol shooter can perceive any difference or advantage using a titanium firing pin! The fact they can produce lighter firing pin hits is not a good thing, so a heavier mainspring is often needed.

I do not use any titanium firing pins in any of my 1911 or STI 2011 handguns....and my guns shoot and cycle great!
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  #8  
Old 02-18-2020, 08:07 AM
jjfitch jjfitch is offline
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To pass mandated drop test!

Quote:
Originally Posted by Rwehavinfunyet View Post
The advent of the titanium firing pin was marketed to say it produces faster "lock time." It probably is slightly faster since it has less mass, however, it is highly unlikely a pistol shooter can perceive any difference or advantage using a titanium firing pin! The fact they can produce lighter firing pin hits is not a good thing, so a heavier mainspring is often needed.

I do not use any titanium firing pins in any of my 1911 or STI 2011 handguns....and my guns shoot and cycle great!
I remember it a little differently. As I recall the Ti firing pin was introduced as an expedient to get 1911's to pass the mandated drop test.

Smiles,
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  #9  
Old 02-19-2020, 12:55 PM
Alland Alland is offline
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Quote:
Originally Posted by jjfitch View Post
I remember it a little differently. As I recall the Ti firing pin was introduced as an expedient to get 1911's to pass the mandated drop test.

Smiles,
Titanium firing pins were being marketed for the decreased lock time long before California implemented the drop test requirement. Springfield used them to pass the drop test intead of using a firing pin block.
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  #10  
Old 02-19-2020, 08:29 PM
jjfitch jjfitch is offline
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To pass mandated drop test!

Quote:
Originally Posted by Alland View Post
Titanium firing pins were being marketed for the decreased lock time long before California implemented the drop test requirement. Springfield used them to pass the drop test intead of using a firing pin block.
Thanks for confirming my post since the OP is talking about the S/A ILS!

Smiles,
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  #11  
Old 02-19-2020, 09:30 PM
Jason D Jason D is offline
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Quote:
Originally Posted by jjfitch View Post
Thanks for confirming my post since the OP is talking about the S/A ILS!

Smiles,
The titanium firing pin they used is the exact reason the mainspring in the ILS was 28 pounds, and still some guns had light firing pin strikes.
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