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HK 91

HK 91 Self Loading Rifle Manual

Below has been recreated from an original HK 91 manual. Click the link below to view and download the pdf manual

HK 91 Self Loading Rifle Manual

HK 91 Firing

HK 91 General Information
The Self Loading Rifle HK 91 is the non-military design of the well-known Automatic Rifle G3, adopted as standard weapon by the Deutsche Bundeswehr (Federal German Armed Forces) and the armed forces of several other nations. The HK 91 is like the G3 a recoil operated weapon incorporating a delayed roller locked bolt system and designed for semi-automatic fire. The cartridges are fed from a 20-round magazine. The HK 91 excels particularly because of its excellent firing accuracy. A telescopic sight with mount can easily be attached to the already existing receiving means of the Rifle HK 91.

HK 91 Loading

  1. Set selective fire lever at “S” = safe.
  2. Retract cocking lever engaging it in the recess of the cocking lever housing.
  3. Insert filled magazine into the magazine well until the magazine catch locks magazine into position.
  4. Let cocking lever snap forward.

The rifle is loaded and “safe”.

HK 91 Firing

  1. Disengage the safety.
  2. Pull the trigger.
  3. Engage the safety whenever firing is interrupted or completed.

HK 91 Unloading

  1. Check to make sure that the selective fire lever is at “S”= safe.
  2. Remove magazine by pushing magazine catch button to the left.
  3. Retract cocking lever.
  4. Check to make sure whether chamber is empty.
  5. Let cocking lever snap forward.
  6. Disengage the safety.
  7. Pull the trigger.
  8. Engage the safety.

HK 91 Stripping the Rifle for Cleaning

  1.  The Rifle HK 91 is stripped and re-assembled without any tools.

Before Stripping the HK 91 Rifle

  1. Put at “S”= safe.
  2. Remove magazine.
  3. Unload rifle.
  4. Unhook carrying sling at front eyebolt.
  5. Remove back plate with butt stock.
  6. Remove grip assembly.
  7. Retract bolt assembly by means of the cocking lever and remove the bolt to the rear.
  8. Push cocking lever forward.

Stripping the HK 91 Bolt Assembly

HK 91 Stripping Bolt Assembly

HK 91 Stripping Bolt Assembly

  1. To strip the bolt assembly grasp the bolt head carrier with one hand, rotate the bolt head with the other hand and pull it from
    the locking piece.
  2. Rotate locking piece slightly. This will free the firing pin and firing spring which can then be removed together from the bolt head carrier.

The HK 91 bolt is re-assembled in reverse sequence. Care should be taken with the following:

  1. Push locking piece with its stud into the recess in the bolt head° carrier as far as it will go and rotate approx. 90 towards the check lever.
  2. Push bolt head onto the locking piece in such a manner that the tapered surface of the bolt head stops in front of the nose of the check lever.
  3. Push bolt head against the pressure of the check lever spring as far as it will go. Pull the bolt head forward approx. 1/4″ (approx. 5 mm) in this position.
  4. Rotate the bolt head until its base is even with the base of the bolt head carrier.

Re-assembling of the HK 91 Rifle

The rifle is re-assembled in reverse sequence. Insert the re­assembled bolt into the receiver. The locking rollers must be withdrawn in the bolt head. Check the proper assembly of the rifle by pulling back and releasing the cocking lever several times.

Cleaning the HK 91 Rifle

For cleaning , the weapon must be disassembled as stated. The barrel must be cleaned after each firing. Each shooter will duly clean his weapon if it has not been used for a longer period. For cleaning and preservation any sort of gun oil in normal commercial usage can be used. Prior to every shooting the barrel has to be freed from oil by a clean pull-through.

HK 91 Sights

The HK 91 Sights consist of the stationary front sight in the front sight holder and the rotary rear sight which is adjustable for windage and elevation. The sight cylinder with Y-notch and diopter holes is graduated from 1 – 4. Figure 11 “1” is the Y-notch and figures 112, 3 and 411 are the diopter holes. The settings “2, 3 and 4” correspond to the distances 200, 300 and 400 m.

Adjusting the HK 91 Rotary Rear Sight
If a re-setting is necessary, it is done only by adjustment of the rear sight in elevation or windage.
HK 91 Rotary Rear Sight Elevation Adjustment

HK 91 Rotary Rear Sight Elevation Adjustment

HK 91 Rotary Rear Sight Elevation Adjustment

Insert elevation adjustment tool in the rear sight cylinder so that the wedges of the elevation adjustment tool gear into both grooves of the rear sight cylinder. Insert cross slit screw driver into the elevation adjustment tool and depress. Turn rear sight cylinder manually in the desired direction (at clockwise rotation the point of impact is lowered, at counter-clockwise rotation it raises 3.3 cm at 100 m per notch). After correction remove cross slit screw driver and elevation adjustment tool. Again the catch bolts engage in the two grooves.

HK 91 Windage Adjustment

HK 91 Windage Adjustment

HK 91 Windage Adjustment

Point of impact to the left: loosen clamping screw. Turn adjusting screw counter-clockwise as required. Re-tighten clamping screw.
Point of impact to the right: loosen clamping screw. Turn ad­justing screw clockwise to make necessary correction. Re-tighten clamping screw.
Note: Each revolution of the adjusting screw moves the mean point of impact at a distance of 100 m 13.2 cm in either direction.

HK 91 Specifications 

  • length of rifle – 40.15 in.
  • Length of barrel – 17.55 in.
  • Sight radius – 22.52 in.
  • Weight of rifle without magazine – 9.63 lbs.
  • Weight of magazine filled with 20 cartridges – 1.32 lbs.
  • Telescopic sight – Hensoldt 4 x 24
  • Telescopic sight mount – HK spec. mount

HK 91 Accessories 

  1. Carrying sling
  2. Telescopic sight with mount
  3. Cleaning kit
  4. Rear Sight adjusting tool

HK 91 Self Loading Rifle Manual