DPM Mechanical Recoil Reduction System for 2011 Open 5" Bull Barrel 9 Adjustable User Settings
DPM Systems
- Item description
- Weapon compatibility list
- Manufacturer information/GPSR
DPM Systems -1911-2011 5" - Bull Barrel only - Edward Rivera Special Edition - MS-1911/ A1-5ER
DPM Mechanical Recoil Reduction System for 1911-2011 5" Bull Barrel - 9 Adjustable User Settings.
- The World's Only Progressive Triple Spring Recoil System is a revolutionary, patented innovation designed to optimize firearm performance.
- As a direct drop-in replacement for your firearm’s stock recoil rod, it requires no modifications, making it for both professionals and enthusiasts seeking enhanced control and reliability.
- This advanced system utilizes a proprietary multi-spring mechanism, featuring three nested springs of varying tension, all compactly housed within a durable precision-machined metal guide rod.
- The progressive spring architecture ensures that resistance increases as the slide moves rearward, offering a controlled deceleration that reduces wear and improves overall function.
- At the core of the system lies the third internal spring, which uniquely engages during the final phase of slide travel.
- This final-stage damping prevents the violent impact of the slide against the frame, thereby protecting critical internal components from excessive stress and prolonging the service life of the firearm.
- Some systems also include additional external springs and, in some cases, various adapter sleeves, allowing you to adapt the weapon to your personal needs depending on the ammunition used. This is particularly interesting for reloaders.
Advantages:
- Significantly Reduces Felt Recoil: Enhances shooter comfort and minimizes muzzle rise.
- Faster Target Reacquisition: Allows for quicker follow-up shots and improved accuracy.
- Increased: Minimizes frame battering and reduces the risk of malfunctions, even under high round counts.
- Drop-In Installation: No gunsmithing required—fits seamlessly into compatible firearm models.
- Durability and Longevity: Built from high-quality steel alloys to withstand extreme conditions and thousands of firing cycles.
- Custom-Tuned for Specific Firearms
- This system is especially beneficial in competitive shooting, tactical operations, and high-volume training environments, where firearm longevity, shooter endurance, and consistent performance are paramount.
Suitable for:
- 2011 in 5 Zoll - BUL SAS II Bullesteros (Special Edition Edward Rivera )
- Caliber: 9mm / .40 S&W / .45 ACP
- Barrel length: 5"
- Barrel Type: Bull Barrel Only - Rod End Pental Shape
Specifications:
Power Rates Table
| Short Spacer With: |
Slide on the battery (idle position) |
Slide full open position (approx.) |
| Short Spring |
5.0 lbs |
13 lbs |
| Medium Spring |
5.51 lbs |
13 lbs |
| Long Spring |
6.39 lbs |
13 lbs |
| Medium Spacer With: |
Slide on the battery (idle position) |
Slide full open position (approx.) |
| Short Spring |
5.29 lbs |
17 lbs |
| Medium Spring |
5.84 lbs |
17 lbs |
| Long Spring |
6.5 lbs |
17 lbs |
| Long Spacer With: |
Slide on the battery (idle position) |
Slide full open position (approx.) |
| Short Spring |
5.51 lbs |
20 lbs |
| Medium Spring |
6.06 lbs |
20 lbs |
| Long Spring |
6.60 lbs |
20 lbs |
The Kit includes:
- 1 Multi-spring Rod
- 3 spacers (each a different length)
- 1 spring plug
- 1 red pressure plate tool
- 1 metallic cup screw tool
- 3 different external springs
- The longer spacer gives you a stronger buffer effect, while the shorter spacers reduce that effect for a lighter feel
- The washers only affect how much resistance the slide has when fully open, and the external springs only affect how the slide closes (when it’s in battery).
- The external springs also come in different lengths—the longer spring is stiffer, and the shorter one is softer. This lets you fine-tune how the slide opens and closes to match your personal shooting preferences.
Download User Guide
Please note! The offered accessory product fits according to our knowledge on the following weapon models.
Please also note the exceptions in the item description under “Not suitable for”.
This information is without guarantee. For further questions you can contact our expert team from Mo.-Fr. 9:00 – 17:00 under the following phone number +49 (0)2206 9519 440.

DPM Systems
The DPM Systems Technologies LTD has been founded in Greece in 2003 with
the aim to design and develop technological products that improve the
operation of all portable defensive weaponry. The design, production,
and the assembly of these products are umbrellaed under the legal
protection in the Greek Patent Office (Industrial Property Organization)
(O.B.I.).
Some of the best-known products are the DPM magazine floorplate with
integrated glass breaker carbide and the DPM mechanical recoil reduction
systems, the only multi spring intricate rod (three springs) systems
that reduce not only the recoil but increase also the possibility of
controlling the functionality of the gun.
Details on the Product Safety Regulation (GPSR):
Responsible person for the EU
Manufacturer and importer information
Company name: ISS International Security School & Services GmbH®
Postal address
Street: Krombacher Str. 39
Postcode: 51491
City: Overath
Country: Germany
Contact person: Konstantinos S. Kanakaris
Telephone number: +49(0)2206 9519440
Email address: shops(at)issprotectiontrade.com