Ultra Mainspring - Kimber Forum


Go Back   Kimber Forum > Kimber Forum Discussions > Gunsmith

Like Tree1Likes
  • 1 Post By RustyIron
LinkBack Thread Tools Display Modes
Old 03-24-2017, 07:46 AM   #1
Junior Member
Join Date: Jan 2017
Location: Western Kentucky
Posts: 27
Ultra Mainspring

I am replacing my Mainspring housing on my CDP Ultra and decided to buy all the parts that go with it as well (spring, pins, etc.). I mistakenly ended up with a 21 pound mainspring rather than the 23 pound that comes with the gun. What are the benefits/drawbacks of going with the 21 vs. the 23?
chas1723 is offline   Reply With Quote
Remove Ads
Old 03-24-2017, 07:49 PM   #2
Senior Member
RustyIron's Avatar
Join Date: Aug 2014
Location: La Habra, California
Posts: 3,198
It'll decrease the pressure of of your trigger pull, at the expense of decreasing the force with which the firing pin strikes the hammer. It's not a big chore to swap them out, so give it a try and see if you like the trigger and if it affects reliability.
Chuck43 likes this.

Join the NRA
RustyIron is offline   Reply With Quote
Old 05-17-2017, 07:52 AM   #3
Senior Member
rlacrossjr's Avatar
Join Date: Apr 2016
Posts: 193
Ultra Mainspring

Should not have any issues. I have ultra CDP with a Wilson combat 18# low power in my MSH. If you looking for aluminum MSH, best two on the market are vzgrips is my favorite at 6082 grade and the. Wilson combat at 7075 grade. Hogue are ok.
One trick to make sure your firing pin is hitting hard enough is use a number 2 pencil with eraser in and shoot it out. Or I use Pachmayr Widget, works great for reinstalling thumb safety and to test firing pin. Mine shoot out good 5feet.

Sent from my iPhone using Tapatalk

Last edited by rlacrossjr; 05-17-2017 at 08:16 AM.
rlacrossjr is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sold archive FS-Gun Storage and grips officer size rlacrossjr Parts & Accessories 10 04-17-2017 05:52 AM
Ultra Carry II Magazines? swca Kimber 1911 Forum 9 11-11-2016 10:00 AM
Ultra CDP II Range Session azguy1911 Kimber 1911 Forum 5 09-23-2016 11:24 PM
Ultra RCP II Slide forumpete Kimber 1911 Forum 6 09-10-2016 06:56 PM
Re-Springing an Ultra Aegis goodoz Kimber 1911 Forum 5 08-08-2016 02:20 PM