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H&K, CETME, and G-3 Rifles

Bob Dunlap is a renowned expert on most of todays and yesterday’s important AND obscure firearms. He has been a warranty station for most manufacturers, both large and small. His understanding of the design, function, and repair of firearms in general is unsurpassed, and his appreciation of European and exotic arms is legendary among his students. The H&K series of roller-locked military assault rifles and their semi-auto counterparts were an extremely successful evolution of a Polish idea, brought to fruition by both the Germans and the Spanish. The guns have been imported to the U. S. in big numbers since the mid-80’s. This course is designed to help all of you owners who love the gun, but are a little mystified about its workings. In typical AGI fashion, we use a cut-away gun that allows you to actually see how the various parts work and interact.

If you want the “quick” course on how to get this Teutonic meisterwerke rifle apart, back together, and operating as intended, then this course is for you (if you want the “long course”, look into our basic 108 hour Professional Gunsmith course).
Among the items covered are:

History

• The Wehrmacht found the original roller locking design in the Radom plant in Poland after they invaded. They liked the design as well as Bob does. They developed the system and used a forebear of the current system in the G-43.
• The Germans had some problems with the gun involving headspace and tearing the rims off. The design engineer in charge of the project decided to take a vacation in Spain to relax and clear his head. H e got so relaxed he didn’t go back home
• After the war he went to work for the Spanish CETME group and continued to develop the rifle
• SIG in Switzerland and Heckler & Koch in West Germany were also working on the design
• SIG’s solution is “groovy”, and CETME goes with salad dressing
• CZ-52 uses roller locking as well, but not delayed blowback
• System doesn’t require a bunch of stuff like pistons, gas tubes, etc., hanging from the barrel, all forces are in a straight line so the guns tend to shoot well (accurately)
• See the chamber fluting, and why the system tends to be self cleaning
• System also tends to compensate for cartridge length variances (headspace)
• Roller locking system seems to be becoming passè
• Guns seem to have less recoil than other systems

Design & Function

• Roller locking system described and shown
• How the system compensates for varying cartridge lengths
• What controls headspace, and how to cure excessive headspace
• Why you probably shouldn’t do it yourself
• Why the extractor of a roller lock rifle needs to very robust, and why its hook must not be negative
• The fire control group is very much like that of the .30 M1 Carbine
• Demonstration of how the sear moves fore and aft, as well as rocks, and explanation as to why
• Demonstration of how the sear works as its own disconnector
• Since the safety only blocks the movement of the trigger, it is not “positive”. How it can be overridden if the system is negative
• Demonstration of the ejection cycle, how the rearward movement of the bolt raises the ejector, and why the ejection is so violent
• What mashes up the brass
• Demonstration of the locking system in the gun with the carrier locked up
• Why this gun does not have a standard style operating handle attached to the bolt or carrier
• How the camming action of the operating handle releases the bolt and carrier from engagement
• Why the locking system system can go 150,000+ rounds without appreciable wear but the sheet metal receiver will develop stress cracks

Disassembly

• Extensive disassembly, and instructions on how to take apart those parts/assemblies not disassembled, such as the recoil spring guide and operating handle. Parts not removed have the reason for that explained
• Field stripping the gun
• Operating handle details
• Magazine catch and rear sight details
• Bolt assembly, rollers, and extractor
• Spare parts
• Safety features and firing pin
• Trigger group details, how to take it apart, but why you probably don’t want to
• You get a good look at how the various parts fit together and interact (particularly the springs) as Bob “’splains” things

Cleaning & Lubrication

• AGI cleaning & lubrication methods shown, along with the reasons for their use
• Ejector disassembly
• Cleaning
• Lubing the “Bob” way, and what kind he likes
• Trigger housing reassembly
• Bolt reassembly
• Bolt carrier reassembly
• After cleaning, dry with air gun, or in the oven on Warm ~185-200 degrees (metal parts ONLY)

Reassembly

• Bolt insertion
• Forearm assembly
• Trigger housing insertion
• Buttstock assembly
• Final thoughts

Accessories

• Magazines
• Scope mounts
• .22LR conversion
• Accessories overview

If you noticed how often the terms “explanation”, and “demonstration” are used, you may be getting some idea of why this course is a “must have” for any CETME, H&K, or G-3 owner, or someone who intends to be.

Master Gunsmith and instructor, Bob Dunlap, takes us on an educational tour of Heckler and Koch’s very popular USP pistol. Bob utilizes a cutaway firearm and various other models of the Universal Self-loading Pistol to demonstrate the design and function of this reliable firearm. After covering the history of Heckler and Koch, we get to take a look at some of the differences between the “standard”, tactical, and compact models of the USP, to help you decide which model or models might be best suited to your needs. This Armorer’s course will enable you to disassemble and reassemble your pistol and avoid some frustrations and common mistakes that are often made by the novice pistolsmith. Bob cautions you about certain areas and jobs in regard to this particular firearm, like the safety features and doing “trigger jobs”. If you want the “long course”, look into our basic 108-hour Professional Gunsmith course.
Among the items covered are:

• Bob brings us back to the middle of the twentieth century, during the Post WW II era, to discuss H&K’s beginnings
• Various Heckler and Koch firearms are shown and discussed; some of which became commercial successes, while others, equally well designed, did not

• In depth explanation of the firing sequence of the pistol that utilizes a cutaway gun, allowing the viewer to get a look inside the pistol in a way unlike any other
• Explanation and demonstration of the parts and their operation
• A unique look at the gun’s various recoil and buffering systems and how they work
• A discussion of the design of various magazines and magazine catches and their advantages
• Explanation and demonstration of both the single and double action firing cycles
• Safety features and the decocking mechanism are explained
• Explanation and demonstration of extraction and ejection operations given

• Extensive disassembly is shown and explained.
• Captivating plungers and springs are discussed, so you can avoid the “Gunsmith crawl” (looking for launched parts)
• The correct order in which parts should come out, so that other parts are not stuck inside the gun
• Cautions are given so that you do not break some of the smaller parts inside of the pistol

• AGI cleaning and lubrication methods shown, along with the reasons for their use
• When drying parts in the oven, do so ONLY with the metal parts and do not exceed 200 degrees

• The correct order in which the parts must go back into the frame and slide
• Details on springs and how to be able to tell if they are in the correct position
• Special tools that need to be made to allow for easier assembly and an explanation of why they are needed
• Correct method for installing the firing pin and spring
• Helpful common tools for getting the parts in their correct places are shown in use
• Tips on how to avoid frustration and ease the reassembly are given
• Making sure that you have no parts “Left over”
• A continued discussion of how certain parts work with one another
• Final thoughts and impressions of the pistol are given

• A frank discussion of the pros and cons of certain accessories available for the USP
• Double action only hammer is shown and explained for the compact model

If you noticed how often the terms “explanation”, and “demonstration” are used, you may be getting some idea of why this course is a “must have” for any USP owner

From the rare single shot pistol manufactured at the turn of the century, to the exposed hammer H.D. Military, to the latest competition grade models made by the New Hi-Standard Manufacturing Company of Houston Texas, this AGI Armorer\'s Course covers them all in comprehensive detail. A fascinating look at one of the most successful .22LR Target pistols ever made, the Hi-Standard has a very interesting history, much of which is documented by AGI for the very first time. Other subjects covered include how to determine which method you must use to disassemble a particular model. Using the wrong method can result in permanent damage to the pistol! Also basic function and repair is covered along with trigger and safety adjustments. This is one of Master Gunsmith Bob Dunlap’s favorite pistols, and his care and expertise in dealing with the subject makes it obvious.

If you want the “quick” course on how to get the High Standard Auto Pistol apart, back together, and operating as intended, then this course is for you (if you want the “long course”, look into our basic 108 hour Professional Gunsmith course). Among the items covered are:

• Bob gives us a visual and oral history of the Hi-Standard pistol through the use of several different models of these guns and his extensive knowledge of firearms in general
• The first gun we are shown in the evolution that leads to the design of the Hi-Standard pistol is the Fiala Arms pistol, circa 1920
• The Fiala Arms pistol becomes known as the “Hartford” Single-Shot Target Pistol, after the Hartford Arms company was bought by Carl Gustav Swebilius of High Standard 
• High Standard became successful at manufacturing .22 caliber single shot and auto pistols
• High Standard’s product line expanded after WWII, and they brought out the Dura-Matic Pistol, which was a big success. Bob shows us one of these which is in his personal collection
• They also produced various revolvers and .22 caliber rifles (also shown), which were bought in large quantities by Sears
• The pistol continued to evolve in its design but the company fell upon hard times and changed hands a few times. The quality of their firearms suffered
• In the 1990s, a new company, based in Houston, Texas, began to produce high quality versions of these firearms again

• The design and function of this straight blowback pistol is shown and demonstrated through the use of various models
• Slides and recoil springs from various models are shown and explained in depth. Their function, as well as removal and reinsertion from and into the receiver, is shown and explained
• Various fire control and safety systems are shown and explained
• Hammer and sear operation is shown and demonstrated
• Trigger adjustments are explained and shown
• Fire control is further explained
• The slide stop and ammunition feeding is explained and demonstrated
• Different magazine designs are shown and explained
• Extraction and ejection is explained and demonstrated
• The evolution of magazine designs are shown and compared
• Firing pin design and function are explained (positive protrusion is defined)
• The design of this pistol is summarized

• Complete disassembly is shown and demonstrated on a cutaway Victor model
• Various models are shown and their differences in disassembly are explained
• Caution is given when disassembling models with the takedown lever on the right-hand side (the older models with non takedown barrel), to leave the side plate in place and never take the lever out with the slide on because you will not be able to get the slide off
• Grips and magazine removal is shown and demonstrated
• Barrel and slide removal is demonstrated
• Slide disassembly is shown and demonstrated
• Barrel disassembly information is given
• Side plate removal is demonstrated
• Safety and trigger disassembly is shown and demonstrated
• Barrel latch removal is demonstrated
• Magazine catch removal is explained and demonstrated. Reassembly is discussed
• Hammer and sear removal is demonstrated
• Sear spring is discussed
• Magazine disassembly is shown and demonstrated

• AGI cleaning & lubrication methods are explained, along with the reasons for their use
• After cleaning, dry with air gun, or in the oven on Warm ~185-200 degrees (metal parts ONLY)
• Lubing the “Bob” way, and what kind he likes

• The correct order of parts for reassembly is given so that you don’t have any parts “Left over”
• Slide reassembly is shown and demonstrated
• Troubleshooting tips for the extractor are discussed (spring out is explained)
• Barrel latch reassembly is demonstrated. Problem areas are discussed
• Trigger reassembly is demonstrated
• Sear, mainspring and hammer reassembly is demonstrated
• Trigger bar and safety reassembly is shown
• Troubleshooting tips for trigger bar and sear are explained in depth
• Magazine catch reassembly is shown (techniques for easier reassembly are demonstrated)
• Sear spring tensioner reassembly is shown
• Slide stop and grips reassembly is demonstrated
• Final reassembly of slide and barrel are demonstrated
• Summary

If you noticed how often the terms “explanation”, and “demonstration” are used, you may be getting some idea of why this course is a “must have” for any High Standard Pistol owner, or someone who intends to be.