Springfield GI with ILS system

K

keys85

Moderator
I was going to install a new mainspring and mainspring cap to remove this system. I am curious as to if I will notice a better trigger pull by going from the 28# mainspring used in this system, to a stock 23# one.

There is also some confusion as to whether the GI gun uses a 14# or a 16# recoil spring. I was planning on keeping the gun set up as JMB intended as this is my back-up carry rig. However, I can not seem to find a 16# spring, but Wilson combat does supply a 17# one. I thought by going less on the mainspring anyways this would probably even things out.

Does anyone know (military spec sheet perhaps) what the proper length of the recoil spring should be? I believe the military used to measure them to check when they needed replacement.
 
You can get a 16# spring from Wolff: www.gunsprings.com. IIRC, to swap the ILS parts out of Springfield 1911's the Mainspring Housing, Mainspring, Cap, & Pin all need to be replaced. Also thought the sear was finished a bit different on these pistols. Either way, run the function tests when reassembled. OAL on a new Govt. size spring is ~6.5"

Funnel
 
spring

Sir;
When I worked at Novaks we usually installed an 18# recoil spring, but I'm not sure I am doing that all the time.
I like a 16# spring in my Caspian framed pistol - it feeds better!
I don't shoot enough anymore to bother anyway!
Harry B.
 
I hear that the hammer strut used is a bit shorter and would have to be replaced as well if removing the ILS system. Is this true?
 
I can't remember & don't have a Springfield to check. Nominal length on a regular size hammer strut is 2.015 from base to center of pin hole.

Funnel
 
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