How To Lighten Your SIG Sauer Trigger Pull For Cheap

SIG SAUER Reduced Power Mainspring Installation Guide
How to Firearms TIPs by Brownells, Inc. Gun Guru, John Furman.

SIG P229 Legion Trigger
SIG P229 Legion Trigger

Iowa, USA – -(Ammoland.com)- Hey guys! John Furman here, one of the Brownells, Inc. Gun Gurus.

I wanted to share a quick tip on how to lighten your Sigs trigger pull for cheap. Here is an installation guide I put together with my P229 Legion handgun. This kit will work on any SIG Sauer P220, P226, and P229 with the newer style short mainspring. Brownells Edge Members get FREE Shipping on all their orders.

Wolff SIG Mainspring Kit ~ $9.99

This kit contains a 17, 18, and 19 lb spring in it, which is up to a 7 lb drop from the factory spring depending on which spring you use and which model Sig you have. On my SIG Legion the 18 lb spring dropped my double-action trigger pull by about 3.5 pounds. Your results may vary depending on which particular Sig you have.

Installation is super easy and only takes a few minutes to do.

SIG P229 Legion Trigger Upgrade
SIG P229 Legion Trigger Upgrade

Step 1 – Safety first. Make sure your gun is unloaded.

Step 2 – Decock your hammer. Changing this spring is nearly impossible if the hammer is cocked.

Step 3 – Remove the grips. This is easy enough, just unscrew the two screws on each side with a proper flat head screwdriver. Throw those ugly screws in the trash and get yourself a nice set of hex / Allen screws to replace them. Hogue has a nice set of Grip Screws that we stock at Brownells.

SIG P229 Legion Trigger Upgrade Step 3 - Remove the grips
SIG P229 Legion Trigger Upgrade Step 3 – Remove the grips

Step 4 – You can now see the mainspring on the back of the grip towards the bottom. If you look on the bottom you’ll see a hole in the plastic retainer. Use a pin tool to place into this hole and push up and out on that retainer to get it released from the metal part of the frame.

SIG P229 Legion Trigger Upgrade Step-4 See the Mainspring
SIG P229 Legion Trigger Upgrade Step-4 See the Mainspring
SIG P229 Legion Trigger Upgrade Step-4 See the Mainspring 2
SIG P229 Legion Trigger Upgrade Step-4 See the Mainspring 2
SIG P229 Legion Trigger Upgrade Step-4 See the Mainspring 3
SIG P229 Legion Trigger Upgrade Step-4 See the Mainspring 3

Step 5 – Now is a good time to grease up the hammer strut. You can wiggle the entire thing out of the gun, there’s nothing holding it in place anymore. Grease up the part that sits inside the spring. On the other end of the strut, look for wear marks. Those are the friction points. Grease up anything that shows wear. Lucas Extreme Duty Gun Grease or Mil-comm TW25B both work great.

SIG Sauer P229 Legion Trigger Upgrade Step-5 Good time to grease
SIG Sauer P229 Legion Trigger Upgrade Step-5 Good time to grease
SIG Sauer P229 Legion Trigger Upgrade Step-5 Good time to grease 2
SIG Sauer P229 Legion Trigger Upgrade Step-5 Good time to grease 2

Step 6 – Put the spring and strut back into the gun. The strut has to engage the hammer the right way, so try pulling partially back on the hammer. If it pushes the strut down, it’s in the right place. If it doesn’t, try re-positioning it. Once you have the strut in right, put the spring retainer in the same way you took it out. I typically put it back in by hand, I find it easier just pushing on it with my thumbs.

SIG-Sauer Handgun Trigger Upgrade Step-6 Put the spring and strut back
SIG-Sauer Handgun Trigger Upgrade Step-6 Put the spring and strut back

Step 7 – Function check the pistol before you put the grips back on. You’ll want to make sure it cocks properly, both double and single-action trigger pull works correctly, and the decocker works correctly. Just make sure to keep your hand clear from the mainspring and strut so you don’t get pinched.

Step 8 – Reinstall the grips and you’re done!

Wolff SIG Mainspring Kit
Wolff SIG Mainspring Kit

One thing that is important to note is that running a lighter mainspring will reduce the force that the hammer falls at.

If you’re running ammo with hard primers you may run into issues. If you choose to do this to a carry gun, you’ll want to run plenty of proper self-defense ammo through it as a test to ensure your ammo choice ignites reliably with the lighter mainspring. In my experience, the 18 lb spring has been reliable for me.

It is good to measure your trigger weight before and after the upgrade with a tool like the Wheeler Engineering Trigger Pull Scale found here.

The Weapon Light is a Streamlight TLR-7 found here. Final Tip: use the coupon codes below to $ave some money!



About Brownells:

Serious About Firearms Since 1939, Brownells is the world’s leading source for guns, gun parts and accessories, ammunition, gunsmithing tools and survival gear. With a large selection of both common and hard-to-find items, and an extensive collection of videos, articles, and gun schematics, Brownells is the expert for everything shooting-related. Committed to maintaining our great traditions, Brownells has more, does more, and knows more – and guarantees it all, Forever. For more information or to place an order, call 800-741-0015 or visit Brownells.com. Stay up-to-date with Brownells on YouTube, Facebook, Twitter, and Instagram.

Brownells

Brownells.com Coupon Codes

10% OFF Orders $150+
AMMOLAND
Expiration Date Unkown

$25 Off Orders $250+
JAN25
Expiration Date 01/31/2024

$125 Off Orders $1000+
JAN125
Expiration Date 01/31/2024

10% OFF Orders $150+
AMMOLAND
Expiration Date Unkown

$10 off $100
AMMOLAND10
Expiration Date Unknown

$15 off $150
AMMOLAND15
Expiration Date Unknown

Some of the links on this page are affiliate links, meaning at no additional cost to you, Ammoland will earn a commission if you click through and make a purchase.
1 Comment
Most Voted
Newest Oldest
Inline Feedbacks
View all comments
Oldman

I don’t know for sure, but how would most people know that you changed out the mainspring? I have modified every Glock we have, my 9mm Spanish Star, and a Taurus. I have not modified any others, as they work just fine without it.