Posted: 3/11/2011 1:40:33 PM EDT
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Replacing the recoil and MSH springs, SA kit doesn't include a mainspring cap pin, looking at a SA pin set on Midway, it states:
"Springfield Armory uses a locking system in the mainspring housing and that system does not require a mainspring cap pin." Pin Set on Midway Looks to me like someone has been all up in this pistol as the mainspring cap is certainly NOT the SA one. In fact I KNOW for a fact someone has been inside the thing (I bought it used) because when I stripped it to the frame, I discovered the hammer strut was NOT pinned to the damned hammer 
OK - so it's a Loaded 1911 and has an ILS, which I can not see affecting the mainspring any way, shape or form. Puzzled, so I appeal to the ARFCOM 1911 gurus. Install the SA pins, with the new springs and drive on, or use a mainspring cap pin, new springs and give it a go? |
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The ILS lock will retain the mainspring for removal, on a factory SA gun.
If you remove the ILS lock, you will need a MSH cap pin to retain the mainspring and its associated guts. As to the hammer strut, I wouldn't blame the previous owner just yet... SA is more than capable of that level of fuck-up, and worse. |
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You need to get a mainspring cap and mainspring cap pin IF the mainspring cap is the stock ILS one. The ILS mainspring cap is designed differently and isn't retained by a pin (although they thankfully drill the hole for the retaining pin anyways). Getting the pin makes taking the mainspring off much easier since you don't have to worry about finding a pin to retain it, or having the mainspring decide to hop out. By all means, replace the spring too. They put a 28lb mainspring in there to give the hammer a little more power to overcome the titanium firing pin/heavy firing pin spring for consistent ignition. The ones I've replaced haven't had a single problem with light strikes. |
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I just put a new Nighthawk Magwell MSH on my MC Operator bot have not taken it to the range yet but did not install a Mainspring cap pin and reused the same hardware that was in the old one will that be fine to use or do i need to get one first? Also can i put one in without taking the MSH off? |
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http://www.ar15.com/content/page.html?id=292 If you put a mainspring cap pin into a stock Springfield ILS system it'll restrict their mainspring from fully extending and your 1911 will not go bang. My .02 - Either use the ILS as provided by Springfield or replace the entire ILS Mainspring housing assembly with JMB's original design replacements. |
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Quoted: http://www.ar15.com/content/page.html?id=292 If you put a mainspring cap pin into a stock Springfield ILS system it'll restrict their mainspring from fully extending and your 1911 will not go bang. My .02 - Either use the ILS as provided by Springfield or replace the entire ILS Mainspring housing assembly with JMB's original design replacements. Thanks for the link I just bought the Mainspring Cap and pin from my Local Shop a few hours ago before i saw this but now i need a spring what poundage should i go with? The 19# like it says or is there something better? Sorry for the super thread Hi-Jack |
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Quoted:
Quoted:
http://www.ar15.com/content/page.html?id=292 If you put a mainspring cap pin into a stock Springfield ILS system it'll restrict their mainspring from fully extending and your 1911 will not go bang. My .02 - Either use the ILS as provided by Springfield or replace the entire ILS Mainspring housing assembly with JMB's original design replacements. Thanks for the link I just bought the Mainspring Cap and pin from my Local Shop a few hours ago before i saw this but now i need a spring what poundage should i go with? The 19# like it says or is there something better? Sorry for the super thread Hi-Jack 19# is fine, it's what I use. You can go heavier, but there's no reason to. You can go lighter but those can have trouble setting off hard primers. |
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Ok after debating this issue and examining the MSH ILS, I just can't see how the ILS does anything to hold the parts in place. Granted, I have no idea if the ILS has been disabled, but after looking at it and what diagrams I was able to find, I am pretty certain it has been.
So I replaced many of the parts with Wilson Combat pins, etc - re-assembled it last night - owing to needing a sear spring - I busted up a new one and the old one looked a bit rough. I replaced the recoil spring with an 18.5 and the mainspring with a 25 as well as added the neoprene recoil buffer. The reason for this? I loaded some Hornady XTP to run about 1,000 FPS - chronoed between 1,012 and 1,016. The SA is a steel frame, my Kimber is aluminum, so even though I have the springs and what not to do that 1911, I may just hold off and run something a bit lighter through that pistol. Thanks for all the advice, the photos and insight. I'll report back on how it ran. |
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Quoted:
Ok after debating this issue and examining the MSH ILS, I just can't see how the ILS does anything to hold the parts in place. Granted, I have no idea if the ILS has been disabled, but after looking at it and what diagrams I was able to find, I am pretty certain it has been. The ILS really doesn't hold the parts in place like a standard captive MSH assembly. While the ILS MSH is installed, the spring and cap are free to move up out of the MSH, but obviously don't because the hammer spur's holding them in. To capture the spring assembly for removal of the ILS, you have two options. You can use the little boomerang-shaped pin through the pin cap hole to hold the cap down, or you can lock the ILS, which is basically a cam that engages the hemispherical groove in the ILS cap and locks it in place. |
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Ran fine with the 18.5 recoil and 25 MSH springs IF I ran the 1,000 FPS load out of certain mags. I had issues with one WC mag and I guess it will go back - feed lip on one side don't look right.
I need to test more - I had 3 mags, 2 of which were good, the WC being the oddball. I had some loaded with between 5.7 and 6.4 of HP38 and then the hotter ones at 9 g of Power Pistol. It was like night and day. The 9 grains of PP packed a hell of a punch, while the lesser rounds failed to cycle properly and/or lock open on the last round. You could tell just as soon as you pulled the trigger, what you were running. More next week . . . Saturday is usually range day. |