H&K 91 / PTR 91 / Cetme




“In a world compromise, some men don’t.”

– Heckler & Koch advertising slogan from the 1980’s –



Contents:



CETME vs. PTR-91 vs. H&K G-3:

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HK-91 / G-3:

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PTR-91:

General Information:

Discussions About Ammunition in the PTR-91:


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Century Arms CETME C308:



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Disassembly & Maintenance:

disassemble_the_g3_rifle_by_saudi6666-d729mr2

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H&K Parts & Accessories:

Parts Distributors:

Fixed Stocks:

  • Coming soon.

Telescoping Stocks:

hk-91-g-3-telescoping-stockPictured right is the old style “meat tenderizer” telescoping stock.  They usually can be purchased online for around $200.  They have two positions: Open & Closed.  They locked open and closed solidly and without any play.  They are very uncomfortable to shoot with in terms of how the metal bars of the stock rub your cheek, and how the studded butt pad act like a meat tenderizer on your shoulder.  These stocks work great when you need to compact the rifle for transport, but they are not the best option for rapid and accurate shooting.  Save your money and go with the less expensive fixed stock discussed above and spend the savings on ammunition and training.  A+ with “Cool Factor”.  D- with practicality.

Adjustable Stock:

magpul-mag340-prs2-precision-adjustable-stockMagpul Stock PRS 2 Precision Rifle Adjustable HK 91, G3 Synthetic Black

Forends:

  • Coming soon.

Optics Mounts:

  • Coming soon.

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How To Zero Diopter Sights On H&K Style Weapons:

While this page is dedicated H&K G-3 / 91 rifles firing the 7.62x51mm NATO round, because the procedure is so similar to other H&K weapons, information for sighting in the H&K 93 / 53 / 33 series of 5.56x45mm NATO battle rifles, and the H&K MP5 / 94 series of 9mm submachine guns are included.

For Future Reference:

  • POA = point-of-aim.
  • POI = point-of-impact.
  • 30 meters = 33 yards.
  • 100 meters = 109 yards.
  • 200 meters = 218 yards.

H&K Diopter Sights Essentials:

The HK G3 or HK-91 sight is calibrated for standard 145 to 150 grain M80 ball ammunition.

The front sight post is non-adjustable.

Zeroing the rifle is accomplished with the rear sight which is adjustable for windage and elevation using thin, needle nose pliers and a Phillips screwdriver.

The rear sight has four positions to select from.  The large V-notch “1” setting provides an unobstructed view for CQB style, close-range, snapshot shooting.  With the V-notch it is easy to maintain target acquisition while running & gunning, shooting from a moving vehicle, during rapid fire, or in low light.

In low-light conditions fill the V-notch with the front sight ring as pictured to the right.  In low light the ring will remain visible even after the front sight post has disappeared.  The V-notch is found only on full-size G3 / HK-91 style rifles and not on MP5 submachine guns.

The “1” setting is not a 100 meter setting as one might be led to believe. The V-notch “1” setting and the 200 meter setting “2” have the same point of aim.  Where the V-notch provides easy target acquisition at close range and with rapid fire shooting, the “2” setting’s peep-sight increases the depth of focus and makes the sight picture much sharper when aiming at further distances.  When the G3 or HK-91 is properly zeroed and the rifle’s sight set to the “2” setting, the bullet’s trajectory will provide a near zero of 30 meters.  This means that when you initially zero your rifle you can use the “2” setting and then zero at 30 meters.  You can then verify zero at 200 meters.  After zeroing your rifle for 30/200 meters with the “2” setting, the rifle will be zeroed at 300 meters with the “3” and 400 meters with the “4” setting.  The proper sight picture for using the “2”, “3”, and “4” settings are illustrated below.

Tools Necessary To Adjust H&K Rear Diopter Sights:

To adjust Diopter sights you will need the following tools:

  • H&K sight adjustment tool or snap ring pliers.
  • #2 Philips head screwdriver.

 

HK G-3 / HK-91 / PTR-91 — 7.62x51mm NATO:

As discussed earlier, H&K G3 and clone rear sights have a setting for close range CQB shooting, and peep settings for 200 meters, 300 meters, and 400 meters.

When properly zeroed, the H&K G3 has the same POA/POI at 30 meters (33 yards) and 200 meters using 7.62x51mm NATO ammunition, so the easiest technique is to zero at 30 meters with the “2” setting, and then verify your zero at 100 meters with the “1” setting.

Windage Adjustment Technique:

  • Set up a target at 30 meters from the muzzle of the rifle.
  • Set the rear sight drum to the “2” position.
  • Fire a 3-5 round test group from a rested position (beanbag, bipod, etc.). Adjust sights to move your shot group towards your point-of-aim. Shoot another test group. Repeat as necessary until point-of-aim = point-of-impact.
  • Some sights may have a windage knob, while others may simply have an adjustment screw.  There is also a set screw prevents the sight being bumped off windage zero. Loosen the set screw with a #2 Phillips screwdriver and turn the windage adjusting screw or knob the desired amount of ¼ turns. When adjusting the sights on any type of weapon, remember the acronym FORS: Front Opposite, Rear Same. Since all sight adjustments with H&K Diopter sights are made with the rear sight, move your sight in the same direction as you want your bullet group to move. Turning the adjusting screw clockwise moves the POI left, counterclockwise moves the POI right.  After zeroing the rifle, be sure to tighten the set screw.
  • For the G-3 / 91 series of rifles, turning the adjustment screw 1/4 turn will laterally shift POI 1.29″ (3.3 cm) at 100 meters.

Elevation Adjustment Techniques:

  • The mechanical method to adjust elevation with H&K style diopter style sights with an H&K rear sight tool or inexpensive snap-ring pliers is discussed further in this section.
  • For the G-3 / 91 series of rifles, turning the sight cylinder 1/4 turn will raise or lower POI 1.29″ (3.3 cm) at 100 meters.

 

HK-93 / HK-53 / HK-33 — 5.56x45mm NATO:

Windage Adjustment Technique:

  • Range: Coming soon.
  • Fire a 3-5 round test group from a rested position (beanbag, bipod, etc.). Adjust sights to move your shot group towards your point-of-aim. Shoot another test group. Repeat as necessary until point-of-aim = point-of-impact.
  • Loosen the clamping screw with a #2 Phillips screwdriver and turn the adjusting screw the desired amount of ¼ turns. When adjusting the sights on any type of weapon, remember the acronym FORS: Front Opposite, Rear Same. Since all sight adjustments with H&K Diopter sights are made with the rear sight, move your sight in the same direction as you want your bullet group to move. Turning the adjusting screw clockwise moves the POI left, counterclockwise moves the POI right.
  • For the 93 / 53 / 33 series of rifles, turning the adjustment screw 1/4 will laterally shift POI 1.6″ (4 cm) at 100 meters.

Elevation Adjustment Techniques:

  • The mechanical method to adjust elevation with H&K style diopter style sights with an H&K rear sight tool or inexpensive snap-ring pliers is discussed further in this section.
  • For the 93 / 53 / 33 series of rifles, turning the sight cylinder 1/4 will raise or lower POI 1.6″ (4 cm) at 100 meters.

 

HK MP5 / HK-94 — 9mm NATO:

The H&K MP5 / 94 has the same POI at 25 and 75 meters using 9mm NATO ammo.

Windage Adjustment Technique:

  • Set up a target at 25 meters from the muzzle of the rifle.
  • Set the rear sight drum to any desired aperture (smallest will give you the most precision and least margin of error).
  • Fire a 3-5 round test group from a rested position (beanbag, bipod, etc.). Adjust sights to move your shot group towards your point-of-aim. Shoot another test group. Repeat as necessary until point-of-aim = point-of-impact.
  • Loosen the set screw with a #2 Phillips screwdriver and turn the adjusting screw the desired amount of ¼ turns. When adjusting the sights on any type of weapon, remember the acronym FORS: Front Opposite, Rear Same. Since all sight adjustments with H&K Diopter sights are made with the rear sight, move your sight in the same direction as you want your bullet group to move. Turning the adjusting screw clockwise moves the POI left, counterclockwise moves the POI right.
  • For the MP5 / 94 series of submachine guns, turning the adjustment screw 1/4 turn will laterally shift POI .51″ (1.37 cm) at 25 meters.

Elevation Adjustment Techniques:

  • The mechanical method to adjust elevation with H&K style diopter style sights with an H&K rear sight tool or inexpensive-snap ring pliers is discussed further in this section.
  • For the MP-5 / 94 series of submachine guns, turning the sight cylinder 1/4 turn will raise or lower POI .55″ (1.37 cm) at 25 meters.

 

H&K Diopter Sight Elevation Adjustments:

Using The H&K Tool:

  • Insert the elevation adjustment tool into the rear sight cylinder in such a manner that the wedges of the tool engage the two splines in the cylinder that contains the catch bolts.
  • Now press the Philips-head screwdriver into the adjustment tool and hold firmly. You can now rotate the rear sight cylinder the desired amount of ¼ turns.
  • For the G-3 / 91 series of rifles, turning the sight cylinder 1/4 turn will raise or lower POI 1.29″ (3.3 cm) at 100 meters.
  • For the 93 / 53 / 33 series of rifles, turning the sight cylinder 1/4 will raise or lower POI 1.6″ (4 cm) at 100 meters.
  • For the MP-5 / 94 series of submachine guns, turning the sight cylinder 1/4 turn will raise or lower POI .55″ (1.37 cm) at 25 meters.

Don’t waste your money on an expensive H&K sight adjustment tool. Instead, use an inexpensive set of snap ring pliers discussed next and save your money to buy ammunition.

H&K Diopter Elevation Adjustments Using Snap Ring Pliers:

Harbor Freight's Snap Ring Pliers 03Do not waste your money on an expensive H&K sight adjustment tool. I used a $6 pair snap ring pliers from Harbor Freight (seen right). They work perfect. You can pick these up at any tool store. Some store will be less expensive than others. There is no reason to purchase an expensive pair. Unless you are planning on using this for other jobs involving snap rings, you will only need to use this tool one time, so just get the cheap one. Read the following directions and watch the video about how to adjust H&K rear sights.

Procedure:

  • Use the snap ring pliers to press in the catch bolts.
  • You can now rotate the rear sight cylinder the desired amount of ¼ turns as described above.
  • Make sure the catch bolts re-engage the splines after the adjustment is done.
  • Turn the sight drum to the desired aperture.

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Magazine Release Paddle Installation:

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Identify Spent Cartridge Casings From A G-3 Type Rifle:

Flute Stripes:

As part of the delayed roller action, G-3 type rifles have fluted chambers to allow hot gas from the gunpowder ignition to pass by the cartridge casing while it is still in the chamber (as seen in the photo above and to the left).

The hot, dirty gas will leave stripe marks on the empty brass (as seen in the photo above and to the right).  I’m not aware of any other type of weapon system that marks brass this way.

Casing Dents:

HK G3 Extractor Damaged BrassG-3 Type rifles have a very large extractor to rip out and eject spent cartridges.  During ejection the brass will get a large dent in the side (as seen in the photo to the right).  Like the stripe marks discussed above, I’m not aware of any other weapon that dents its brass as it is ejected.

Keep in mind that you will not be able to reload your brass after firing it from a G-3 type weapon.

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Savannah Arsenal’s Related Pages:

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Recommendations:

PTR makes fantastic H&K G-3 clones.  Do yourself a favor and purchase one with a factory installed scope rail and paddle magazine release.

Stay away from any builds from Century Arms. They suck. I bought one. The quality, accuracy, and reliability was extremely poor.  I was fortunately able to return it for a full refund (after disclosing that I had already discussed the danger of their product with my family attorney).  Do a little internet research. CAI has a horrible reputation.

Use a fixed stock and avoid an old style meat tenderizing telescoping stock.  It’s more comfortable, and less expensive.  Use the money that you save for ammunition and training.

Have a magazine paddle release professionally installed.  Don’t do it yourself.

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