Springfield ILS...msh replacement question

[threeperreaper]

QUESTION!
If I replace the msh and put in a standard main/hammer spring (23lbs I believe) will that change anything?

The factory one from Springfield is 28lbs...should I buy a 28lbs replacement hammer spring if I swap this out?! If so, why?

Also, i believe if the gun is running a heavier hammer spring, it should be a lighter recoil spring (i believe) does anyone know for sure if they ship w/ 16lbs recoil springs?!

Also, have you ever had an issue with the ILS locking up on you? etc.

[SDDAVE56]

The only issue with mine, I totally forget its there.

[Catch]

Springfield doesn't think they're necessary either. I think they've been discontinued.

https://forums.1911forum.com/showthread.php?t=718162

[Two Nuggets]

New models don't have the ILS.

Check the 1911 forums. Plenty of good information for your liking.

[threeperreaper]

New models don't have the ILS.

Check the 1911 forums. Plenty of good information for your liking.

well 3 of mine have them...sooooo....

[alland]

If you change to a 23 pound mainspring I would recommend replacing the titanium firing pin with a steel firing pin. I have read some reports of light primer hits with the titanium firing pin.

California Springfields continue to have the ILS due to the roster. In most other states the ILS has been dropped.

[Denver Dick]

I replace the I.L.S. with an Ed Brown ached MSH, you can go with a flat checkered MSH if that's what you like. You must also purchase new non-I.L.S. internals, including a hammer spring. I've settled on a factory standard 23#. The reason SA uses such a strong (28-30#) hammer spring is to overcome the fact that they use a titanium firing pin (low mass) and a super strong and long firing pin spring. I kept the light weight Ti firing pin, but use a regular 70 series firing pin spring (for me a Wilson Combat factory plus firing pin spring, part #R12). Some will note that a standard 70 series firing pin spring might increase the chances of a discharge if the pistol is dropped. But, it should be kept in mind that maintaining the Ti firing pin (which is 1/2 the weight and mass as a regular firing pin) already greatly reduces the chance of such a discharge. Now, if I were to change out the firing pin for a steel or stainless steel firing pin, then I would use a Wilson Combat Extra Power firing pin spring. Just my $ .02.

Others will have different approaches, this is mine. FWIW

Good Luck.

[santacruzgunner]

I just replaced mine with 23 lb MS. Couldn't tell the difference

[MosinVirus]

If replacing the ILS MSH with a standard MSH, don't forget to simply get a MSH refill kit.

The caps are different so is the length of the spring.



Personally I replaced mine (when I had a 1911 mil spec) because I got tired of needing a tool to take the pistol apart, and because I wanted to go with a different option for MSH.

[JTROKS]

I went as low as 17lb hammer spring and used a Ti cap with my LT 9mm. The Ti FP had to be changed out as the t would have light strikes on hard primers. In this case I opted for the extended FP and used the FO spring provided with 11 LB Wolff recoil spring pack. It ignites even rifle primers for reliability sake. The gun is strictly for range and competition use.

[TexasJackKin]

I changed out the "guts" on my Springfield with standard 1911 parts. I liked the idea of spreading spring strain over a longer spring. I noticed no difference in function or feel. Keeping the titanium firing pin and spring. I did add a titanium hammer strut and titanium main spring cap.

[Robert1234]

Replaced with EGW MSH/magwell.

17 lb mainspring, 9 lb recoil spring. Never an issue onver thousands of rounds.

ILS is less usefull than Kimber or Colt firing pin block systems and easier to get rid of.

[threeperreaper]

Would it be okay if I left EVERYTHING else stock and just switched to a 23 lbs main spring?

[MosinVirus]

Would it be okay if I left EVERYTHING else stock and just switched to a 23 lbs main spring?

No. The end cap (Top one) is different. It's head is longer, so if you put a standard length spring in there, you will collapse the spring into coil lock and still not have enough travel for your hammer to go into full cock

[Robert1234]

New MSH, spring, end caps and retainer pin. None of this will break the bank, and if you go with the 17 or 18 lb mainspring, you'll have a slightly lighter trigger pull. And reliability will not be compromised.

You can keep the MSH, and forgo the retainer pin, but why?