My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Wish list
Your basket is empty. (0)
Basket
Newsletter Newsletter
Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Handgun Parts Trigger Group Parts Performance Enhancing Kits HARRISON DESIGN & CONSULTING EXTREME SERVICE SEAR Support

Upgrade your 1911 with Harrison Design's HD-120 ignition components, featuring hardened tool steel for durability, precise fit, and reliable performance.
-8 %

HARRISON DESIGN & CONSULTING EXTREME SERVICE SEAR

100004782

Filters:

Variations
Filters:
Variations:

Variations:

-8 %
Upgrade your 1911 with Harrison Design's HD-120 ignition components, featuring hardened tool steel for durability, precise fit, and reliable performance.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - EXTREME SERVICE SEAR
54.9 GBP 5 £54.90 * £59.90
In stock
Make: 1911 Model: Government, Commander, Officers Product no.: 100004782
In stock
54.9 GBP 5 £54.90 * £59.90
-11 %
Upgrade your 1911 with the HD-120 Extreme Service Disconnector, crafted from hardened tool steel for unmatched durability, reliability, and precise fit.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - EXTREME SERVICE DISCONNECTOR
41.9 GBP 5 £41.90 * £46.90
In stock
Make: 1911 Model: Government, Commander, Officers Product no.: 100004783
In stock
41.9 GBP 5 £41.90 * £46.90
-9 %
Upgrade your 1911 with HD-120 ignition components, featuring hardened tool steel for durability, precise fit, and enhanced reliability under demanding conditions.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - HD-120B IGNITION SET
199.9 GBP 1 £199.90 * £219.90
In stock
Product no.: 100011124
In stock
199.9 GBP 1 £199.90 * £219.90
Upgrade your 1911 with the HD-120 Ignition Set, featuring hardened tool steel components for unmatched durability, precise fit, and reliable performance.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - HD-120 IGNITION SET
214.9 GBP 0 £214.90 *
Backorderable
Product no.: 100004374
Backorderable
214.9 GBP 0 £214.90 *
Upgrade your 1911 with the HD-120 Extreme Service Hammer, featuring hardened tool steel for unmatched durability and reliability, ensuring a precise fit.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - EXTREME SERVICE HAMMER
Not available
Finish: Unfinished Make: 1911 Model: Government, Commander, Officers Product no.: 100004781
Not available
99.9 GBP 0 £99.90 *
41.9 214.9 5 GBP
-8 %
MSRP £59.90
54.9 GBP £54.90

Prices inclusive of duty & VAT.

Product no.: 100004782

Mfr. No.: HD-122

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.
In stock 5 pcs. in the USA warehouse
4.9/5 - 15 Customers
1
2
3
4
5
6
7
8
9
10+
-8 %
MSRP £59.90
£54.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Delivery time approx. 7-14 days.

100-Day Return Policy

Delivery time approx. 7-14 days.

100-Day Return Policy
No charges until we ship
No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.
  • Durable hardened tool steel
  • Precise drop-in fit
  • Enhanced wear resistance
Wish List Ask question
41.9 214.9 5 GBP
Description Specification Customers reviews Accessories

HARRISON DESIGN & CONSULTING EXTREME SERVICE SEAR

-8 %
MSRP £59.90
54.9 GBP £54.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+
-8 %
MSRP £59.90
£54.90

Prices inclusive of duty & VAT.

1
2
3
4
5
6
7
8
9
10+

Delivery time approx. 7-14 days.

100-Day Return Policy

Description:

Upgrade your 1911 with precision-engineered components.

The 1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS from HARRISON DESIGN & CONSULTING are designed for enthusiasts seeking durability and reliability in their firearm's ignition system.

Product Features

  • High-Grade Tool Steel: Each critical ignition part is machined from hardened tool steel, ensuring a precise fit and consistent function.
  • Wire-EDM Cut & CNC Machined: Components are crafted with +/-.005" tolerances for a drop-in fit on many 1911s.
  • Heat-Treated: Maintains dimensions through thousands of firing cycles with a hardness rating of Rc 53-56.
  • Pre-Prepared Hammer Hooks: Ensures precise contact and a crisp, clean letoff.
  • Commander-Style Hammer: Features an elongated spur with deep serrations for secure thumb purchase.
  • Beveled Edges: Resists snagging on clothing and protects the thumb from abrasion.
  • Narrow Hammer Body: Prevents unwanted slide contact.

HD-120 Set Includes:

  • Hammer
  • Sear
  • Disconnecter

Each component is also available separately, allowing for tailored upgrades to your firearm. The HD-120B set features a black IonBond DLC coating on the hammer, providing a traditional blued look combined with wear and corrosion resistance similar to hard-chrome.

Specifications

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

Enhance your 1911's performance with the HD-120 EXTREME SERVICE components today!



Attributes

  • Finish: -
  • Model: 
    Commander
    , 
    Government
    , 
    Officers
  • Weapon type: 
    1911
  • Delivery weight: 0.045kg
  • Shipping height: 8mm
  • Shipping width: 83mm
  • Shipping length: 146mm

Item details

Made in USA
US export classification: 0A501.c

Customers reviews

Customer ratings (15)

4.9 / 5
Recommended

Brownells USA makes a fair drop in 28/01/2018

good looking part but not made for any of the colts I tried to fit the head is to lose in the port at the pistol I could feel it moving when pulling on the trigger my shooters complained of this and I had to go with EGW I'd rather take of to fit correctly than have a less then drop in part.

Definitely recommended

Brownells USA Almost too pretty to install 25/03/2017

Some of the nicest machined parts I've ever seen. Did require fitting of thumb safety as expected. Trigger pull is now one of the best I've ever felt.



Variations:

-8 %
Upgrade your 1911 with Harrison Design's HD-120 ignition components, featuring hardened tool steel for durability, precise fit, and reliable performance.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - EXTREME SERVICE SEAR
54.9 GBP 5 £54.90 * £59.90
In stock
Make: 1911 Model: Government, Commander, Officers Product no.: 100004782
In stock
54.9 GBP 5 £54.90 * £59.90
-11 %
Upgrade your 1911 with the HD-120 Extreme Service Disconnector, crafted from hardened tool steel for unmatched durability, reliability, and precise fit.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - EXTREME SERVICE DISCONNECTOR
41.9 GBP 5 £41.90 * £46.90
In stock
Make: 1911 Model: Government, Commander, Officers Product no.: 100004783
In stock
41.9 GBP 5 £41.90 * £46.90
-9 %
Upgrade your 1911 with HD-120 ignition components, featuring hardened tool steel for durability, precise fit, and enhanced reliability under demanding conditions.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - HD-120B IGNITION SET
199.9 GBP 1 £199.90 * £219.90
In stock
Product no.: 100011124
In stock
199.9 GBP 1 £199.90 * £219.90
Upgrade your 1911 with the HD-120 Ignition Set, featuring hardened tool steel components for unmatched durability, precise fit, and reliable performance.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - HD-120 IGNITION SET
214.9 GBP 0 £214.90 *
Backorderable
Product no.: 100004374
Backorderable
214.9 GBP 0 £214.90 *
Upgrade your 1911 with the HD-120 Extreme Service Hammer, featuring hardened tool steel for unmatched durability and reliability, ensuring a precise fit.
1911 AUTO HD-120 EXTREME SERVICE IGNITION COMPONENTS - EXTREME SERVICE HAMMER
Not available
Finish: Unfinished Make: 1911 Model: Government, Commander, Officers Product no.: 100004781
Not available
99.9 GBP 0 £99.90 *

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2025 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top