PTR Industries in South Carolina is building the PTR91, a semi automatic version of the well designed robust Heckler and Kock 7.62mm NATO battle rifle.   Once used by the German military, the G3 has been popular in the export market, being adopted by the armed forces of over 40 countries.  If you watch the evening news you will see that Mexico, Pakistan and Iran all still make the G3 under license.  In western Afghanistan, Iranian made G3s and MP5s are common status symbols.   Where did this ubiquitous rifle come from?  Nazi engineers and wartime necessity combined to produce an amazing weapon system.

Let’s start the story at the beginning.  In 1943, Russian hordes were re-introducing the human wave to 20th century warfare.  The Wehrmacht (German Army) disobeyed a Führer directive and developed a new kind of gun.  Designed for mass production, the rifle was designed to fire full auto and take advantage of the 7.92×33 Kurtz cartridge.

German 7.92 x 33 cartridge
German 7.92 x 33 cartridge

They hid the development by calling it a submachine gun (MP43 and MP44) and sent it to the Russian front.  When Hitler asked the Commanders on the Russian Front what they needed to win in the east, they said “More of the new rifles!.  He shot the gun and liked it so much he didn’t schedule a single execution.  He named it the Sturmgewehr 44 (assault rifle).  Always a master of propaganda, his made up name is still used by modern national socialist to slander civilian semi-automatic rifles.

StG44 photo courtesy of world.guns.ru
StG44 photo courtesy of world.guns.ru

The StG44 was made of stamped and welded steel.  Difficulties with manufacture, use available non-priority steels and the friction of war resulted in an unnecessarily heavy receiver for the intermediate cartridge which it fired.

Another design for a Mauser rifle chambered in 7.92 mm Kurz inspired a whole new concept.  This breakthrough was too late for the Nazis, but it planted a seed which would later bloom for Mauser’s love child, Heckler & Koch.  Some geek running the analytical department at Mauser, deep in the basement in Oberndorf devised a version of the retarded (I like that term better than delayed) blowback system.  What a genius, there is NO gas system, NO piston and NO rigid locking. Elegant and simple, rollers are used to retard the bolt just long enough for the chamber pressure to drop to safe levels.  This became the StG45.  When American forces captured Oberndorf, no more than 30 of these rifles existed.  There was no springtime for Hitler, but this idea was too good to remain in the rubble of Mauser Werk.

StG45 photo courtesy of world.guns.ru
StG45 photo courtesy of world.guns.ru

We all know how the story ends, the team with the prettiest uniforms lost, due in no small part to their sophisticated weapons which they could not mass produce.  In 1949 Heckler & Koch (the Germans pronounced it Heckler and  Cock.  They never did figure out why Americans find that funny) was founded by engineers Edmund Heckler, Theodor Koch, and Alex Seidel formerly of the Mauser rifle company.  I never could find out why Seidel didn’t get his name on the sign.   H&K made machine tools, sewing machine parts, and gauges and dreamed of the day they would again make guns.

CEAM Modele1950 photo courtesy of wikia.com
CEAM Modele1950 photo courtesy of wikia.com

Some of the more agile Nazis escaped Germany and were recruited to make guns for France.   German engineer Ludwig Vorgrimler of StG45 fame spent 3 years working on the French version of the Sturmgewehr for the CEAM company.  It was called the Carabine Mitrailleuse Modèle 1950. Since France was busy losing the war in Indochina and looking toward NATO standardization, France couldn’t afford to produce this new rifle and continued using antiques and American hand me downs

A variety of bullets
6.5mm Arisaka, 7mm Medium, .30 M1 Carbine, 7.92mm Kurz, 7.62mm AK-47, 7.62×45 Czech, 9×39 Russian (silenced AP – replica round), 5.56×45 SS109, 5.45×39 AK-74, 5.8×42 Chinese. Photo courtesy of Tony Williams: Military gun and ammunition website and discussion forum
CETME photo courtesy of weaponeer.net
CETME photo courtesy of weaponeer.net

You can’t keep a good engineer down, Vorgrimler didn’t file for generous French unemployment, he moved to fascist Spain and designed LV-50 rifle originally chambered for the 7.92Kurz cartridge.  The  West German Border Guards (Bundesgrenzschutz),  were interested in this rifle, but wanted a NATO round.  CETME produced the Model A chambered for the 7.62x51mm CETME cartridge, identical to NATO 7.62 in chamber dimensions but with less velocity.  Close, but not NATO standard.

G1 photo courtesy of fotki.com
G1 photo courtesy of fotki.com

In 1956, the Bundesgrenzschutz instead adopted the Belgian FN FAL(It was called the G1 by the Germans, probably because they didn’t want it  to look like they were buying guns from Belgium). The Belgans later refused to grant a license to manufacture them in Germany.  Too soon?   In November 1956 West Germany ordered 100,000 additional FALs, for the army. The G1 is distinguished from other FAL weapons by a pressed metal hand guard and a removable flash hider.

The new West German Army was looking across the inner-German border with their M-1 Garrands and G-1s at the new East German Army carrying the StG44 and the SKS.  Our Germans wanted a new NATO standard rifle to keep the Warsaw Pact Armies on their side of the border.  In 1958, they conducted trails between the German designed CETME, calling it G3, the Swiss SIG SG 510 (G2) and the American AR-10 (G4).  I guess they wanted to German-up the Spanish, Swiss and American guns too.

G3 photo courtesy of ww2mmg.ru
G3 photo courtesy of ww2mmg.ru

In January 1959, the Bundeswehr adopted the Automatisches Gewehr G3.   Rheinmetall and H&K both made the G3.  In 1969, Rheinmetall gave up production rights to the G3 in exchange for H&K’s promise not to bid on the MG3 contract.  The MG3 is a copy of the MG42 general-purpose machine gun rechambered for the 7.62x51mm NATO cartridge.  In 1977, the West German government ceded ownership of G3 production and sales rights exclusively to H&K for the G3.

Don’t get me wrong here.  I am not an H&K hater.  I love the story and the design of the G-3 family, but there are many people who just cannot grok what I am about to say.  It has always amazed me that people associate the G-3 with high quality and precision.  Like the Sturmgewehr 45, the G3 is built for crude war-time production using as many stamped parts as possible. The receiver is stamped from sheet steel. The trigger unit housing along with pistol handle frame, also are stamped from steel. The early G3 even had stamped steel handguards.  If you compare the G-3 to an M-14, an M-16 or an FN FAL you will see the difference between war-time production and precision manufacture.  If you take the stock off, you can look directly into the sheet metal maw of the receiver.  It is a great gun, and its origins are part of its functional beauty.

This modern HK91 receiver flat is virtually identical to the G3 flat. Photo courtesy of RTG Parts.
This modern HK91 receiver flat is virtually identical to the G3 flat. Photo courtesy of RTG Parts.

The G3 is a select fire roller-retardeded blowback-operated firearm. This retardation or delay is achieved by two cylindrical rollers acting as transmission elements against a movable locking piece which drives the heavy bolt carrier.

G3 bolt assembly, Photo courtesy of RTG Parts.
G3 bolt assembly, Photo courtesy of RTG Parts.

The two-piece bolt assembly consists of a bolt head and bolt carrier. The bolt is held in battery by two cylindrical rollers that engage locking recesses in the barrel extension. The breech is opened when both rollers are driven inward against angled ramps of the barrel extension and interact with the wedge-shaped locking piece, pushing it back. This has been likened to the way inertia is passed in a physics balls toy.  http://www.youtube.com/watch?v=nPUL8Zcb2P0  The bolt carrier travels backwards four times faster than the bolt head, ensuring a safe drop of pressure within the barrel prior to extraction.

The chamber is fluted, because the breech opens under very high pressure; this assists in the initial extraction of a spent cartridge casing.  You can always tell fired brass that came out of a G-3.  There are black soot lines that run the length of the case and the brass is nearly bent in half from the vigorous ejection.  I was told that bending the brass kept the enemy from reloading it.

Polygonal vs Normal Rifling
Polygonal vs Normal Rifling

In the pre-war years, German engineers developed a new process for making barrels, cold-hammer forging. The cold hammer forging process work hardens the steel around a mandrel which has a negative form of the rifling. The MG-42 used polygonal rifling where the traditional lands and grooves are replaced by “hills and valleys” in a rounded polygonal pattern. This produced more durable machine gun barrels in less time.  H&K chose this process to make the G-3 barrels.

G3 scope mount. Photo courtesy of RTG Parts.
G3 scope mount. Photo courtesy of RTG Parts.

Every G3 rifle can be equipped with a detachable bipod and a claw-type detachable scope mount.   A folding cocking handle is located on a tube above the barrel, at the left side, and does not reciprocate when gun is fired.  The NATO standard 22mm flash hider mounts a bayonet and serves as an adapter for launching rifle grenades.

NATO 22mm Rifle Grenade. Photo courtesy of D and B Militaria.com
NATO 22mm Rifle Grenade. Photo courtesy of D and B Militaria.com

The 22mm rifle grenade is inserted over the flash suppressor and launched using a special blank cartridge. 22mm grenades include everything from anti-tank rounds to  finned tubes with a fragmentation hand grenade attached to the end. With this system,  it is important to know if there is a blank or a ball round in the chamber.  A friend of mine in El Salvador’s Army said he shot over 50 of these grenades from his G-3 in a fight early in the war.  He said the recoil was pretty severe and he quickly figured out to put the butt on the ground when firing them.  They must work, he lived to tell the story.

G3A3 and G3A4 photos courtesy of maxmerlin.cz

The G-3 had many upgrades over the years.  In the 60’s came modernized production models, the G3A3 (with a fixed plastic stock) and the G3A4 (collapsible stock). They changed the barrel to one using polygonal rifling, added better sights as well as a different 22mm flash hider.

G3 twenty round magazines. Photo courtesy of RTG Parts.

The G3 uses either steel (260 g) or aluminum (140 g) double-stacked box magazines.  H&K also made a 50 round drum.  In El Salvador, I saw some franken mags made welding two 20s together.  Probably not recommended by H&K.  H&K developed a prototype plastic disposable magazine in the early 1960s, but it was not adopted.  The aluminum magazines were just as light and turned out to be more durable, and easier to make.

50 round G3 magazine. Photo courtesy of RTG parts.

H&K produced the G3 until 2001.  H&K and others have made a wide variety of firearms, based on the G3 design.  There are guns made in other calibers, like the 9mm MP-5 submachine guns made famous by the British SAS.  The 5.56mm HK 33 assault rifles were widely exported.  There were belt fed machineguns, the 5.56mm HK23 and the 7.62mm HK 21 machine guns.  The H&K 21 was selected by Delta for the 1980 Iranian hostage mission, Operation Eagle Claw.  The H&K 23 was a contender for the U.S. Army Squad Automatic Weapon trials. Designated for these tests as the XM262, the HK21A1 lost out to the FN Minimi,which is now designated by the military as the M249 SAW. (Squad Automatic Weapon)

HK21 photo courtesy of wikimedia.org

After  the Munich massacre at the 1972 Summer Olympics, West German police units were criticized for not engaging the terrorists quickly enough to prevent them from killing hostages. H&K was commissioned to create a semi-automatic sniper rifle for police and military.  A G3 variant, called the PSG1 has a heavy free-floating barrel with polygonal rifling, a special adjustable trigger and an adjustable stock. The pistol grip is of a target-style with an adjustable palm shelf. It also featured a low-noise bolt closing device (similar to the M-16’s forward assist).

H&K claimed the PSG1 would hold 1 minute of angle (MOA) with match ammunition. This suggests that an average group at 100 yards would be one inch in diameter.  The PSG1 had no iron sights.  It came with a Hensoldt ZF6x42PSG1 scope with a built-in range adjustment feature which can be adjusted from 100 to 600 m  and an illuminated reticule.

Americans are most familiar with the civilian variants of the G-3. Initially known as the H&K 41, some of these rifles were easily converted to full auto with a G-3 trigger pack.  A number of modifications were made and the new H&K 91 had a shelf was welded onto the receiver where the push-pin of the trigger pack would normally go, to prevent installation of a fully automatic trigger pack. There is no magazine release flapper on the HK91, so the button on the right side of the magazine well must be used instead.  Other than these functional changes, it is identical to the G3A3/A4.  Between 1974 and 1989, 48,000 H&K 91 rifles were imported.

Struggling to keep up with changing US import restrictions, they built HK911 which was an HK91A2 with the flash hider removed and the receiver re-stamped with an extra 1 to comply with the US importation ban of 1989. The new designation theoretically made it legally immune to the Import Ban, as H&K 911 rifles were not on the list of banned guns. However, the later banning of several “paramilitary” features on the HK911 made it illegal for importation.

SR 9 photo courtesy of snipercentral.com

The SR9  variants differed from the HK91 in that they had their flash hiders removed and featured a smooth forend that lacked the bipod attachment point.   The pistol grip and buttstock replaced with a one-piece thumbhole stock.  The SR9 series was banned from importation to the United States by President Clinton in 1997 because they could accept standard-capacity magazines.

HK53 photo courtesy of wikia.com

The HK51 is not made by H&K.  It was a name conjured up in the American custom after-market for rifle caliber MP5 length guns. The HK 51 is usually a cut down and modified G3A3 or clones modified to take MP5 furniture and accessories.  It was usually fitted with a collapsible stock and an 8.31 in barrel.

SAR-3

The SAR-3: Semi-automatic copy of HK-91 made by Hellenic Arms in Greece and imported into the United States by Springfield Armory.  The SAR-8: Post-ban version of SAR-3, modified to comply with import restrictions.

In the current market there are several choices.  The PTR-91 is made in America on tooling purchased from FMP, which was an HK-licensed manufacturer in Portugal.   There are also a number of CETME rifles around.

Let’s talk about ergonomics. Why the original G-3 is impossible to use left handed?  In the German Army, it was forbidden to shoot left handed.  Why is the selector/safety impossible to manipulate with the right hand?  The “master grip” of the right hand should never shift.  You use the left hand to reach over the gun and manipulate the selector.  You put it on auto when you cross the border and put it on safe after the enemy’s capital is captured.

How do you change magazines?  There is no bolt hold open on the G3.  The first step in the reload; guess your gun is empty.  You never know for sure until the hammer drops on an empty chamber.  Now we have to reach forward and pull the cocking handle back and lock it to the rear.  On the typical reload, this launches a live round on to the ground.  Then you grab the magazine and hit the flapper with your thumb.  This design forces you to grab the magazine.  At this point, you may as well retain the magazine because this is not a quick process and hey, those are some pricy mags.  If you attempt to cheat the H&K design features and tactical reload on a closed bolt, you are flirting with disaster.  You may have an empty chamber.  Once you get a new mag in position, you lock it in, slap the cocking handle, allowing the bolt to go forward, chambering a round.  You may not want to try this under pressure without extensive practice.  In the early 80’s, El Salvador equipped their forces with the G3.  The average recruit was about 16 years old and all of 5 feet tall.  These guys were tough but they couldn’t reach the cocking handles on their G3s with the weapon shouldered.  The good news was the plastic broke off the cocking handle, leaving a hole in the metal exposed.  The hook on the H&K sling could be attached to this hole in the cocking handle instead of the sling attachment point.  This allowed you to step on the sling and load the G3.  The American advisors referred to this as “kick starting”.

The original G3 had a fixed stock. This stock sloped down to put the sights at eye level. This was a solid easy-to-shoot design. Later came a collapsible stock. The collapsible stock is higher than the fixed stock. A cheek weld is difficult and to put your eye behind the sights requires you to fold your face around the stock. When you shoot it, the 7.62 NATO recoil pushes the stock into your face.  You get the sensation of being hit in the face with a piece of rebar.

Disassembly is not too difficult.  It is harder than an AK and easier than an M-4.  It takes a bit of head scratching to figure out the delayed roller blow back.  If you take the bolt and bolt carrier out, don’t push the bolt in to see how it locks.  The spring that holds the bolt is VERY strong.  It takes two men and a boy to get it unlocked again.   One of the things I found endearing about the fixed stock was the two holes in it.  The take down pins are stored in these holes when the gun is disassembled.  How orderly!

G3 rear sight photo courtesy of RTG Parts.

The iron sights consist of a rotary rear drum and hooded front post. The rear sight, mechanically adjustable for both windage and elevation, has an open notch used to fire up to 100 m and three apertures used for: 200, 300 and 400 m. The receiver has recesses that work with HK clamp adapters used to mount day or night optics.

G3 sight adjustment tool photo courtesy of RTG Parts.

Zeroing? There is a special sight tool, known in the field as “the $75 Phillips head screwdriver” because of the H&K price on the original tool.  This device has a Phillips head which adjust windage and a two horned contraption which depresses two detents to adjust elevation. This goes back to another quaint European idea. Shooters shouldn’t adjust the sights. Expert craftsmen in Obendorf adjusted those sights, you will just screw it up. The sight tool is designed to PREVENT the adjustment of sights. Sight tools are reluctantly sold to Americans.

SEF Trigger group photo courtesy of RTG Parts.

The trigger is OK.  The original SEF trigger group is simple and rugged. (fire selector in the “E” or “1” position – single fire mode (“Einzelfeuer”), “F” or “20” – automatic fire (“Feuerstoß”), “S” or “0” – weapon is safe (“Sicher”), trigger disabled mechanically).   The trigger is a little mushy and the reset is long.  It is functional and reflects the basic design requirements of war time production.  Even prone on the bipod, the gun is difficult to control on full auto.  The recoil of 7.62 NATO is more powerful than the 7.92Kurtz.

As a free American, you can still own a quality semi-auto version of this great gun.  Let’s hope that is not a limited time offer. PTR Industries in South Carolina makes the PTR 91 which is every bit as good it’s German cousins.

PTR

Photo courtesy of PTR

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