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HD-120 Ignition Set
HD-120 Ignition Set
HD-120 Ignition Set
Extreme Service Sear
Extreme Service Disconnector
HD-120B Ignition Set
HD-120 Ignition Set
HD-120 Ignition Set
HD-120 Ignition Set
Extreme Service Sear
Extreme Service Disconnector
HD-120B Ignition Set
None
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HARRISON DESIGN & CONSULTING - 1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS

16 Reviews
Color
Model Number
Brownells #
100004374, 100004782, 100004783, 100011124
MFR #
HD-120, HD-122, HD-123, HD-120-B
UPC
$29.99 - $159.99
Coupon Code
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What is the HARRISON DESIGN & CONSULTING - 1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS?

Critical ignition parts are machined from high-grade tool steel for precise fit and reliable, consistent function under the most demanding operating conditions. Each component is wire-EDM cut, CNC machined and honed to final dimensions with +/-.005" tolerances for drop-in fit on many 1911s, then heat-treated to Rc 53-56 to maintain those dimensions through thousands of firing cycles. Hammer hooks are pre-prepped and sear nose polished for precise contact and crisp, clean letoff. Commander-style hammer has elongated spur with deep serrations to provide extra-secure thumb purchase. Beveled edges resist snagging on clothing and protect the thumb from abrasion, and slightly narrower hammer body prevents unwanted slide contact. HD-120 set includes hammer, sear, and disconnector. Each component also available separately. HD-120B set features a black IonBond DLC coating on the hammer, for those who prefer the traditional “blued” look combined with wear- and corrosion-resistance similar to hard-chrome.


SPECS: Hardened tool steel, in-the-white. Hardened to Rc 53-56. HD-120B set’s sear has a black IonBond DLC finish. Some fitting may be required.


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1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS REVIEWS

4.8
16 Reviews
5 Stars
81%
4 Stars
13%
3 Stars
6%
2 Stars
0%
1 Stars
0%
Reviews Summary
The 1911 AUTO HD-120 ignition components receive high praise for their quality and performance. Many users report that the parts are mostly "drop-in" with minimal adjustments needed and consistently provide a smooth, crisp trigger pull. However, some had to make slight modifications, and a few noted rough finishes on certain pieces. Overall, a solid upgrade for serious 1911 enthusiasts.
What Reviewers Are Saying
Product Quality
75%
Reviewers consistently commend the high quality and craftsmanship of the ignition components, highlighting the polished surfaces and precision machining as standout features. Many are pleased with how well the parts hold up and their longevity, which reinforces the overall satisfaction with the product.
Ease of Installation
60%
Most reviews mention the ease of installation, describing the parts as primarily 'drop-in' with only minor adjustments needed. Users appreciate this convenience, particularly those undertaking their own rebuilds, although a few reviews mention that some fitting is still required for certain firearms.
Performance Improvement
70%
Many users note a significant improvement in trigger pull, describing it as crisper and lighter after installation of the parts. This enhancement in performance is frequently cited as a major reason for choosing this product over competitors, affirming its effectiveness for upgrading existing 1911s.
Fit and Compatibility Issues
30%
While most users praise the fit of these components, some mention issues with compatibility with specific models, requiring additional modifications. This has led to some frustration among a minority of users, indicating that those with certain firearms should be prepared for potential fitting work.
Customer Support
40%
Several reviewers express appreciation for the support received from the manufacturer. Helpful communication and guidance during installation add to the overall positive customer experience, suggesting that the company stands behind their products.
5
Drop-In Perfection
Installed in a TISAS B45 Carry, dropped in without and fitting. Quality of the parts is excellent, hammer/sear engagement was perfect requiring no honing. Sear breaks crisply. Simple adjustment of the sear spring achieved a 4 lbs trigger break, exactly where I wanted it to be.
Would you recommend this? Yes, I would recommend to a friend
by STEVEN BRAIN on July 20, 2025
Verified Purchase
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5
1911 trigger rebuild
My old standby with a nice 3.5 lb trigger started to follow after many rounds. Bought this, talked to the mfg (which was very helpful), installed it as received. Adjusted the spring to 3.5 lb. pull- its great! I am used to honing hammers and sears to get this kind of performance, but this was basically "drop in" with some spring work and right there! With some wear in, should be perfect. Well made parts!
by DARREL RALPH on March 03, 2024
Verified Purchase
Was this review helpful? 1
5
Top of the line
I rebuild 1911s. Over the last two years I've slowly started using Harrison for all my premium rebuilds. Not only are the parts correctly produced from excellent material, the finish work is much better than the next two competitors. When my clients want top shelf parts that work every time and last almost for ever, Harrison Design fits the bill. Internals come already polished to reduce friction and the hammer/sear engagement is exact, Unless the gun is out of spec, very little needs to be done to get a light, crips trigger that never fails. You can buy less expensive or more popular "guts" and spend time tuning them to get the same fit and finish Harrison Design delivers every time, but why? I save the time to use it on other details and the client is always impressed.
by 34SF on March 20, 2022
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5
Very nicely finshed parts.
Beautifully machined parts. Note, the hammer full-cock radius was slightly higher than the original in my Springfield RO Elite Target. That required fitting of the thumb safety sear stop surface for proper operation. With no other modifications, it provided a perfectly crisp 4.0 - 4.25 pound trigger pull.
by 1911 Fan on February 23, 2020
Was this review helpful? 1
5
Very High Quality
Excellent quality parts. The hammer is polished and beautifully finish. Nice serrations on the hammer. Not a drop-in part, but not much work required for a great trigger. I used Ed Brown jig and arkansas + ceramic stones for primary and secondary sear angles, and polished the disconnector where it contacts the trigger bow and sear spring. The machining and polish on the hammer hooks was already as exceptional. The fit of the hammer and sear is perfect. 4 pound trigger job with very little work.
by David on February 10, 2016
Was this review helpful? 1
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