BHAdvanced Trigger Sub-Assembly / Installation / Fitting / Trigger Break-Weight-Tuning

Description

IMPORTANT NOTE: The BHAdvanced Trigger Sub-Assembly + Install, as a “stand-alone-service” is available ONLY to BHVeterans (past customers) who have had their Hi-Power serviced by BHSpringSolutions Service Dept within the past 4 years.

BHSpringSolutions / RDIH ADVANCED TRIGGER SUB-ASSEMBLY FOR HI-POWERS

In 2018, RDIH Founder Leon Hubert (35 Year Designer at FN) and the Co-Founders of BHSpringSolutions LLC initiated cooperative efforts to re-design the Hi-Powers’ Trigger Sub-Assembly.  21 months of continuous refinement and testing produced the Advanced Trigger Sub-Assembly for Hi-Powers, that produces the following functional benefits:

 

• Elimination of the Magazine Disconnect restores this element of John Browning’s original design
• Refined geometry repositions the trigger “shoe” in the Hi-Powers’ trigger guard and affords a straight-back trigger pull and reset motion more characteristic of Browning’s trigger designs
• Wider Trigger that engages with more surface area of the trigger finger is consistent with Browning’s design found in his .22LR Target Pistols. The serrated version of the Advanced Hi-Power Trigger Sub-Assembly also hearkens back to the trigger characteristics of Browning’s .22LR Target Pistols.
• Re-design and refinement of the geometry of the Hi-Powers’ Trigger Pawl (lever) minimizes metal-to-metal resistance of the Trigger Pawl’s relationship with the Hi-Powers’ grip frame and optimizes the engagement point with the Hi-Powers’ Sear Connecting Lever (Sear Lever).
• Because the parts of the Advanced Trigger Sub-Assembly work together more cooperatively than in the original P35 Trigger Sub-Assembly, the Advanced Trigger Sub-Assembly functions on a broader range of Trigger Return Spring strengths……..benefitting the Hi-Power owner because it makes tuning the Hi-Power Trigger within a range of 1 ½ – 2 lbs + or -, as easy as changing the Trigger Return Spring.
• Conflict of the Trigger Return Spring with the Trigger Pin (found in all original design Hi-Power triggers) is eliminated in the Advanced Hi-Power Trigger Sub-Assembly
• Minor, and required, fitting of the Advanced Trigger Sub-Assembly makes possible Optimal Trigger Functionality in all Hi-Power models regardless of manufacturer or generation
• A New Invention of a Magazine-Eject-Assist-Spring can be used with the Advanced Trigger Sub-Assembly for Hi-Powers, that does not degrade the trigger pull. Use of this spring is optional in the design.

 

In Dieudonne Saive’s re-design of John Browning’s Trigger/Trigger Pawl/Trigger-Return-Spring design, certain design attributes were compromised.  To the extent possible, the BHSS/RDIH Advanced Trigger Sub-Assembly for Hi-Power pistols restores John Brownings’ design fundamentals found in the 1927 Grand Rendement.

HISTORY OF THE HI-POWER’S TRIGGER SUB-ASEEMBLY:

JOHN M. BROWNING:

In 1922, John M. Browning designed the last firearm for which he would receive a Patent, most commonly referred to as the 1927 Grand Rendement – denoting the year the Patent was issued.  From many of the design elements of the 1927 Grand Rendement, along with many design elements of the 1911, Dieudonne Saive configured the handgun initially known as the “P35”, later most commonly known as the “Hi-Power”.

It was John Browning, in the 1927 Grand Rendement who first designed a handgun Trigger Sub-Assembly that included the Trigger, a Trigger Pawl (later renamed the Trigger Lever), and a Trigger Return Spring, that form a unit.  Today we call it the Hi-Power’s Trigger-Sub-Assembly.

DIEUDONNE SAIVE:

By 1935, Dieudonne Saive had made numerous design changes to John Browning’s original Trigger-Sub-Assembly, some good, some not, and the end result was a P35 (Hi-Powers’) Trigger Sub-Assembly with numerous non-John Browning-like trigger performance characteristics.   John Browning’s original design contained NO Magazine Disconnect, Dieudonne Saive’s end product did.  And as negative as Saive’s Magazine Disconnect was for the integrity of the Hi-Power Triggers’ “Take-Up” and “Break”, the Magazine Disconnect also played a positive role in the P35’s Trigger Reset.  The final Dieudonne Saive version of John Browning’s Trigger/Trigger Pawl/Trigger Return Spring design also was weak because the design creates a “down and back” trigger pull motion, instead of the “straight back” pull characteristic always found in John Browning’s designs.  And, the Dieudonne Saive design produces a conflict between the Trigger Return Spring and the Trigger Pin for which a “groove” in the HP’s Trigger Pin was necessitated to attempt to eliminate the resistance on the trigger that this design inevitably creates.

AFTER-MARKET AND THIRD-PARTY EFFORTS TO CORRECT THE P35 TRIGGERS’ DEFICIENCIES:

Over the years, multiple third-party companies have produced alternative triggers for the P35, all of which retain many of the original Dieudonne Saive design weaknesses which cannot be eliminated short of a complete re-design of the entire HP Trigger Sub-Assembly.

 

 

CHOOSING THE OPTIMAL TRIGGER RETURN SPRING FOR YOU

The BHSpringSolutions Advanced Trigger Sub-Assembly System contains multiple Trigger Return Springs giving each Hi-Power owner the power to customize the triggers’ performance by simply choosing and installing the best Trigger Return Spring for the application and the shooters’ preference. 

Note: Each of these springs is made from a different diameter of spring wire.  Should your Trigger Return Springs ever get mixed up, measure the diameter of the spring wire with a caliper.  Actual spring diameter may be   + or –   0.01mm.

Trigger Return Spring #1: (0.80mm Spring Wire)

Tactical Trigger Return Spring.  This is the strongest, most rigid, spring option.  Good choice for shooters wanting Maximum Reset Authority in trigger performance.

Trigger Return Spring #2: (0.75mm Spring Wire)

Good General Purpose Trigger Return Spring.  Good Spring to test first, in Hi-Powers with a “Type 1” Sear Lever (non-drop-safety sear lever used on in early FN / Browning Hi-Powers and most Hi-Power Clones).

Trigger Return Spring #3: (0.70mm Spring Wire)

Good General Purpose Trigger Return Spring.  Good Spring to test first, in Hi-Powers with a “Type 2” Sear Lever (Drop-safety sear lever design used in Browning Mark III Hi-Powers and FM95 Series Hi-Powers.)

Trigger Return Spring #4: (0.65mm Spring Wire)

Primarily a “Target Trigger Return Spring”.  Lightest trigger pull and maintains acceptable Reset Performance in most Hi Powers. May be too light for Hi-Powers used in defensive roles.

 

EXAMPLE OF VARIANCE IN HI-POWER TRIGGER BREAK WEIGHTS BY SPRING 

(EXAMPLE SHOWN WAS ACTUAL TRIGGER BREAK WEIGHT AS MEASURED IN AN FN/BROWNING MARK III, EQUIPPED WITH THE HI-POWER FAST SAFETY SYSTEM (SFS), and BHSpringSolutions Optimized Hi-Power Springs.) 

Many components in the Hi-Power design impact actual trigger pull break weights in the Hi-Power design.  The example below is intended to show the approximate increase or decrease in trigger break weights typically obtained with the different Trigger Return Spring options.

TRIGGER RETURN SPRING                                                                       AVG. TRIGGER BREAK WEIGHT

Trigger Return Spring #1: (0.80mm Spring Wire)                           6.0 – 6.25 lbs.

Trigger Return Spring #2: (0.75mm Spring Wire)                           5.5 – 5.75 lbs.

Trigger Return Spring #3: (0.70mm Spring Wire)                           5.0 – 5.25 lbs.

Trigger Return Spring #4: (0.65mm Spring Wire)                           4.5 – 4.75 lbs.