Sig Sauer P211 GTO Complete Teardown and Series 70 Trigger Conversion
Welcome back to Jim's Armory! Today on the operating table, we have the Sig Sauer P211 GTO. We are doing a complete, down-to-the-frame teardown to see just how proprietary this gun actually is. Along the way, we are going to perform a highly popular competition modification: converting the ignition system from a Series 80 to a Series 70.
Here is a full breakdown of the disassembly, what parts are proprietary, and how you can dramatically improve the trigger pull on your P211 GTO.
Safety First and Lower Teardown As always, we start by verifying the gun is completely clear with an empty chamber and no magazine. Pro-tip: Never dry fire a 2011 or 1911 when the slide is off, as you can seriously damage both the hammer and the frame.
Right away, disassembling the lower reveals a few departures from standard 2011 design. The magwell is held on by a captured T15 screw rather than a traditional pin, and the grip panels slide into angled cuts on the frame, secured by T25 screws.
Getting the ambidextrous thumb safeties off requires the hammer to be cocked back. The first time I did this, it was impossibly tight, so I highly recommend using a plastic automotive trim tool to pry it away safely without scratching your gun. Once it's off, I always put a slight bend in the safety detent spring to prevent it from flying across the room during future teardowns.
Proprietary Quirks vs. Standard Parts Tearing deeper into the frame, the P211 GTO is an interesting mix of standard and proprietary components:
The Good: The sear spring is a completely standard 1911 low-power leaf spring, making it easy to tune or replace. The gun is also incredibly ergonomic and comfortable to hold, easily beating out the blockier feel of guns like the Kimber.
The Unique: The trigger is removed from the top of the frame rather than sliding out the back. I attempted to drop in an aftermarket Cheely-style trigger, but it hit the frame's index points and wouldn't fit, meaning the trigger bow might be proprietary. The frame is also built to accept standard P320 magazines, which is why a traditional 2011 magazine won't even fit through the grip frame.
The Bad: The grip module is secured to the frame with massive screws directly threaded into the frame, coated in heavy factory Loctite that required soaking in acetone to remove.
The Series 80 to Series 70 Trigger Conversion The factory P211 GTO uses a Series 80 design, meaning it has a firing pin block plunger inside the slide. When you pull the trigger, an internal lever pushes this plunger up to unblock the firing pin. This added mechanical resistance easily adds about a pound of weight to your trigger pull right before you hit the wall.
To convert this to a crisper Series 70 style, we have to delete those internal lifting levers from the sear pin group. Once the factory actuator lever is removed, you simply replace it with an aftermarket 80-to-70 conversion shim, which takes up the exact .055-.060 inch space left behind by the deleted parts so the sear and disconnect stay properly aligned.
Up in the slide, we drove out the 1/8-inch roll pin retaining the firing pin. Warning: When doing this, you must keep your thumb over the back of the slide, or the spring-loaded firing pin and the block plunger will launch across the room into a portal to another universe. I simply left the firing pin block plunger out entirely and reinstalled the firing pin.
Slide Components and the Plastic Reverse Plug While the frame was great, the slide gave me my biggest disappointment with this gun. Unlike modern 2011s that use innovative tool-less guide rods (like Dawson or Kimber), Sig forces you to use an old-school setup, and the reverse plug is made of cheap plastic. You also need a T8 wrench to remove the spring-loaded compensator before you can slide the barrel out the front.
Reassembly and Final Results Reassembly is straightforward if you use a punch to capture your new conversion shim, disconnect, and sear. After mating the frame back together and performing comprehensive safety checks on the grip safety, thumb safety, and hammer hooks, it was time to test our new trigger.
To dial it in perfectly, I tightened the overtravel adjustment screw on the face of the trigger to eliminate almost all post-break movement, giving it an incredibly short reset.
Before this teardown, the trigger pull was over 3.5 lbs. After deleting the Series 80 firing pin block, the trigger pull dropped to an incredibly consistent average of 2 lbs 5.8 oz.
This conversion takes a great gun and gives it a phenomenal, competition-ready trigger. If you want to see exactly how these parts interact, be sure to watch the full video teardown, and don't forget to subscribe to Jim's Armory!
