EGW Oversized Flat Bottom Firing Pin Stop for Series 70 1911 (.45 ACP) - Blue
Quick Check:
Fits: Series 70 1911 pistols chambered in .45 ACP.
Design: Oversized flat bottom firing pin stop.
Material: Carbon Steel.
Finish: Blued.
Installation: Oversized part that requires fitting.
Made In: USA.
Product Overview
The firing pin stop is one of the smallest components in a 1911, but it plays an important role in extractor stability, slide timing, recoil characteristics, and overall reliability. Factory firing pin stops are commonly manufactured with additional clearance so they can fit a wide range of production pistols. That extra clearance may allow the extractor to rotate, commonly referred to as extractor clocking, which can contribute to inconsistent extraction and ejection.
The EGW Oversized Flat Bottom Firing Pin Stop is precision machined from carbon steel and intentionally manufactured wider and thicker than a standard factory firing pin stop. A traditional GI firing pin stop is approximately .466" wide, while the EGW oversized design provides additional material that can be precisely fit to the individual slide. Once properly fitted, the firing pin stop helps support the extractor and minimizes unwanted lateral movement.
This is a flat bottom firing pin stop designed with only a small .015" radius to break the bottom corner. Unlike firing pin stops with a large factory radius, the flat bottom profile maintains a more square lower edge that changes the leverage between the slide and hammer as the slide begins moving rearward. This can help slow the initial opening of the slide and create a smoother, more controlled recoil impulse when the part is properly fitted and used in a correctly configured 1911.
The internal corners are radiused to reduce stress concentrations and help prevent cracking during extended use. The combination of an oversized body, flat bottom geometry, and carefully radiused internal corners makes this firing pin stop a valuable upgrade for custom builds, competition pistols, duty guns, and shooters working to improve the reliability and recoil characteristics of a Series 70 .45 ACP 1911.
For a more detailed explanation of how firing pin stop fit and bottom geometry affect the operation of a 1911, read our technical article: The Forgotten Upgrade: Why Your 1911's Firing Pin Stop Matters More Than You Think.
Technical Specifications
- Material: Carbon Steel
- Finish: Blued
- Caliber: .45 ACP
- Series: 70
- Bottom Profile: Flat Bottom with .015" Corner Radius
- Design: Oversized Width and Thickness
- Installation: Gunsmith Fitting Required
- Made In: USA
Why Choose This EGW Firing Pin Stop?
- ✔ Flat bottom design with a small .015" corner radius
- ✔ Helps slow the initial opening of the slide
- ✔ Oversized width helps minimize extractor clocking
- ✔ Increased thickness helps reduce lateral movement
- ✔ Can be precisely fit to the individual slide
- ✔ Radiused internal corners help reduce stress concentrations
- ✔ Precision machined from carbon steel
- ✔ Designed specifically for Series 70 .45 ACP 1911 pistols
- ✔ Made in the USA
What Is a Flat Bottom Firing Pin Stop?
A flat bottom firing pin stop has a much smaller radius along its lower edge than the large radius commonly found on factory firing pin stops. The EGW design uses a .015" radius to remove the sharp corner while maintaining the functional benefits of a square, flat bottom profile.
As the slide begins to move rearward, the bottom of the firing pin stop contacts the hammer. A flatter bottom places that contact point lower on the hammer, reducing the slide's mechanical advantage as it begins cocking the hammer. This requires the slide to work harder during the earliest portion of its movement and can help delay initial slide opening.
The firing pin stop is not a replacement for proper recoil spring, mainspring, ammunition, and extractor setup. It is one component of the complete operating system. When correctly fitted and paired with an appropriately configured pistol, a flat bottom firing pin stop can contribute to smoother cycling, more controlled slide movement, and improved overall performance.
Why Is the Firing Pin Stop Oversized?
Factory firing pin stops are generally made with enough clearance to install easily in a wide range of slides. While this simplifies production, excessive clearance may allow the extractor to rotate inside its tunnel. This rotation is known as extractor clocking and may affect how consistently the extractor holds, extracts, and ejects the cartridge case.
The EGW firing pin stop is wider and thicker than standard so it can be carefully fit to the individual slide and extractor. Proper fitting removes unnecessary clearance, provides better extractor support, and reduces movement that may contribute to inconsistent ejection.
Fitment
- Series 70 1911 pistols
- .45 ACP slides
- Custom and production 1911 builds requiring an oversized firing pin stop
Series 70 and Series 80 Compatibility
- Series 80 firing pin stops can be used in Series 70 pistols.
- Series 70 firing pin stops can only be used in Series 70 pistols.
- This product is a Series 70 firing pin stop and is not compatible with a Series 80 firing pin safety system.
Installation and Fitting
This firing pin stop is not a drop-in part. Material must be removed gradually from the sides and other fitting surfaces until the stop fits the individual slide and properly supports the extractor. The fit should be secure while still allowing the firing pin stop to be removed for normal service and maintenance.
Fitting should be performed carefully because removing too much material can eliminate the benefits of the oversized design. The firearm must be inspected for proper firing pin movement, extractor function, slide operation, and safe operation after installation.
Due to manufacturing tolerances between firearms, the amount of fitting required will vary from one slide to another.
Frequently Asked Questions
Is this a flat bottom firing pin stop?
Yes. This firing pin stop has a flat bottom profile with a small .015" radius that breaks the corner while retaining the functional benefits of a square lower edge.
What does a flat bottom firing pin stop do?
The flat bottom profile changes the leverage between the slide and hammer during the earliest portion of slide movement. This can help slow initial slide opening and contribute to a smoother recoil impulse when the pistol is properly configured.
Does this firing pin stop require fitting?
Yes. This part is intentionally oversized and must be fit to the individual slide and extractor. It is not a drop-in component.
Why is the firing pin stop wider than a factory part?
The additional width allows the stop to be precisely fitted to reduce extractor clocking and unwanted movement inside the slide.
Will this fit a Series 80 pistol?
No. This is a Series 70 firing pin stop and is intended only for Series 70 pistols. Choose the appropriate Series 80 version for pistols equipped with a Series 80 firing pin safety system.
Can I install this myself?
Installation requires careful removal of material and verification of extractor, firing pin, and slide function. Professional fitting is strongly recommended.
WE RECOMMEND THIS PART BE FITTED BY A QUALIFIED AND COMPETENT GUNSMITH.
Warning: This product may be alloyed with trace amounts of lead and other elements which are known to the State of California to cause reproductive harm and cancer. To prevent exposure, do not alter the product by welding, grinding, or similar processes. For more information, visit www.P65Warnings.ca.gov.
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