Springfield GI with ILS system

keys85 · October 17, 2008, 11:40 PM

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.

Slopemeno · October 18, 2008, 12:58 AM

Not a huge difference. if you want a trigger job, pay for one- THAT will feel better.

funnelcake · October 18, 2008, 03:32 AM

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

Harry Bonar · October 18, 2008, 09:07 AM

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.

keys85 · October 18, 2008, 05:03 PM

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?

funnelcake · October 18, 2008, 09:42 PM

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

zoomie · October 18, 2008, 09:44 PM

I replaced the ILS and did not change the hammer strut. Works fine.

October 17, 2008, 11:40 PM	#1
keys85 Junior member Join Date: September 20, 2008 Posts: 199	Springfield GI with ILS system 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.

October 18, 2008, 09:07 AM	#4
Harry Bonar Senior Member Join Date: December 5, 2004 Location: In the Vincent, Ohio general area. Posts: 1,804	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.

October 18, 2008, 12:58 AM	#2
Slopemeno Senior Member Join Date: January 19, 2007 Posts: 2,663	Not a huge difference. if you want a trigger job, pay for one- THAT will feel better.

October 18, 2008, 03:32 AM	#3
funnelcake Member Join Date: October 15, 2008 Posts: 29	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

October 18, 2008, 05:03 PM	#5
keys85 Junior member Join Date: September 20, 2008 Posts: 199	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?

October 18, 2008, 09:42 PM	#6
funnelcake Member Join Date: October 15, 2008 Posts: 29	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

October 18, 2008, 09:44 PM	#7
zoomie Senior Member Join Date: January 23, 2006 Location: GA Posts: 1,864	I replaced the ILS and did not change the hammer strut. Works fine.