AR15 Armorers Course

Class Overview

-SAFE Handling, Clearing, and AR15 Safety Devices

-AR15 Nomenclature

-Weapon Familiarization, Features, and Function

-Field Stripping

-Complete Gauging of your AR15

-AR15 vs. M16 Parts Comparison and Legalities

-AR15 Urban Legends and Falsehoods

-How the AR15 Direct Impingement System Works and its Benefits and Tradeoffs

-Why I don’t work on, or permit Gas Piston AR15’s in my Shop/Classes

-Complete AR15 Build Tools and Gauge Use

-Gunsmithing and Tuning

-Detailed Gunsmith Tests, Tips, and Tricks

-Understanding and Checking Headspace

-Over Cleaning, Carbon, and why it is not the boogeyman.

-Cleaning and Lubrication How-To Methods and Scheduled Maintenance

-Cleaning Products and Equipment

-Magazines Inspection

-Sight Alignment, Tools, and Adjustment

-Common Parts Wear and Breakage

-Why the AR has a Forward Assist and its Importance

-Ammo Sensitivity, Weather, Altitude, and Malfunctions

-Lower and Upper Receiver Types, Materials, Coatings, and their Features

-Fire Control Group Types

-Bolt Carrier Types

-Receiver Extension/Buffer Tubes and Types

-Castle Nut Staking

-Adjustable Gas Systems

-Testing and Selecting the correct Buffer and Buffer/Action Spring Combination

-Barrel Extensions and Feed Ramps

-Accurizing and Truing

-Barrel Nut Torque Specifications and Alignment

-Bolt and Bolt Carrier Coatings

-Gas Ring Testing

-Extractor Upgrades

-Gas Key Torque Specifications and Staking

-Gas Blocks and Front Sight Bases

-Pinning Front Sight Bases vs. Clamp-On vs. Set Screw Methods

-Taper Pinning/Dowel Pinning

-Adjustable Gas Blocks

-5.56 vs. .223 vs. Wylde vs. Mod 0 Chambers

-Barrel Twist, Rifling Types, and Ammo Guidelines

-Effects of Steel Cased Ammo

-Barrel Manufacturing and Steel Types

-Barrel Length, Velocities, and Dwell Time

-Barrel Coatings and Treatments

-Gas Ports, Gas Tubes, and Gas System Length

-Gas Block and Gas Tube Alignment

-Gas Port Erosion

-Barrel Contours, Barrel Weights, Fluting, and Dimpling

-Muzzle Threads

-Muzzle Device Pinning

-Muzzle Devices

-Sound Suppressor Mounts

-Handguards, Rail Systems, and Free Floating Systems

-Rail Covers and Heat Dissipation and Buildup and Forward Grips

-Iron Sights and Backup Sights

-Suppressors Setup and Effects

-Diagnosing Malfunctions









-AR15 History

-AR10/SR25 Type Firearms

-Blowback  AR's

-Full Auto Conversions


What will be Gauged on my AR15?

-Measure rested and solid height Action Spring Length

-Inspect/Correct Buffer Roll Pin Protrusion

-Gauge Firing Pin Protrusion with Digital Depth/Anvil Gauge GO/NO-GO

-Gauge Firing Pin Bore in Bolt GO/NO-GO

-Inspect/Test Firing Pin Tip and Straighness

-Inspect Firing Pin Retaining Pin

-Gauge Lower Receiver Hammer & Trigger Pin Bores in the Lower Receiver with U.S. Government Gage GO/NO-GO Gage

-Gauge Upper & Lower Receiver Pivot Pin Bores & Takedown Pin Rear Lug Bore with U.S. Government GO/NO-GO Gage

-USGI Safety Bore Gauge

-Inspect Extractor Assembly

-Extractor Recess Gauge

-Inspect Cam Pin

-Inspect Bolt and Carrier

-Inspect/Test Gas Rings

-Gauge Ejector Spring #

-Gauge Ejector Spring #

-Gauge Trigger Pull

-Inspect/Test Fire Control Group & Safety Function

-Gauge Lower Receiver Front and Rear Lug Recess GO/NO-GO

-Inspect Lower Receiver F.C.G. Pocket and Side Walls

-Gauge Upper and Lower Receiver Gap GO/NO-GO

-Gauge Magazine Lips GO/NO-GO (If Applicable)

-Gauge Lower Receiver Magazine Well with U.S. Government Gauge GO/NO-GO (Applies to Standard AR15 Lowers ONLY)

-Gauge Gas Key for Straightness GO/NO-GO

-Gauge Gas Key Bore with GO/NO-GO Gauge

-Inspect Gas Key Staking and Check Fastener Torque with IN# Torque Wrench

-Gauge Gas Tube Flange GO/NO-GO

-Gauge Gas Tube & Gas Key for Obstructions GO/NO-GO

-Inspect Gas Key & Gas Tube Interface and Alignment

-Inspect Feed Ramps

-Inspect B.C.G. Parts for proper De-Magnetization

-Bed Barrel into Upper Receiver

-Gauge Upper Receiver Bore/Charging Handle Raceway

-Gauge Headspace GO/NO-GO/FIELD

-USGI Bore Straightness Gauge

-Inspect Crown

-Inspect Carrier Travel and check for Gas Key Impacts on Lower Receiver

-Gauge Sound Suppressor/Muzzle Device Alignment GO/NO-GO (YES, Bring your Silencer/Suppressor)

-Gauge Bore Straightness GO/NO-GO

-Gauge Muzzle Erosion (If Applicable)

-Gauge Throat Erosion (If Applicable)

-Gauge Throat for .223 or 5.56 Specifications (If Applicable)

-Gauge Lower Receiver Pivot and Takedown Bores GO/NO-GO

-Use Hawkeye Bore Scope on Laptop to inspect Bolt Carrier Bore & Barrel

-Check Gas Block/F.S.B. Alignment with Hawkeye Bore Scope and Laptop

-Stake Castle Nut (If Applicable)

-Inspect B.C.G. Travel

-Gauge Flat-Top Receiver & Free Float Rail Plane  with Surface Gauge (Optics/Sights Removed)


Course Details & Requirements


Course Size: 4-8


Course Length: 10 Hours


8 A.M. to 6:00 P.M.


Location: Elkton, Maryland


Lunch and Beverages are provided (You may bring your own food and beverages)

Pizza (Lunchtime Only)

Bottled Water

Sweet Tea

Un-Sweetened Tea

Coffee, Sugar, Half & Half, and Sweet Cream
              Hot Tea


Instruction Language: English Only


Wheelchair Accessible: Yes


Armorers Course Certificates and Technical Handouts are provided with Class Admission.


A safety brief is conducted at the beginning of the course and muzzle awareness and trigger finger safety is strictly monitored at all times. When checking in, each student AR15 will cleared by an Instructor and dry fired with the muzzle pointed into a sand bucket.


Hearing Impaired Capable: We are not equipped to meet the needs for those with hearing impairments at the moment. If a hearing impaired student gives notice, I will attempt to seat them at the front.


There will be no Live Fire Testing at any time during the course. No live ammunition is allowed.


There will be loud noises during some parts of the course. There will be Air Compressor and hammers being used. If you are noise sensitive I suggest bringing electronic hearing protection.


There will be 2 students per table and the seating arrangements will be setup in a manner that barrels are not pointing at other students. Chamber flags will be utilized at all times, except when not possible for testing and gauging. If you are attending with a family member or acquaintance please notify me and I will be glad to pair you with them.


This course is a safety oriented but relaxed environment. The course is meant to be a fun and enjoyable learning experience with likeminded people. Your AR15 will be tested and gauged during the course. It is possible that you will find a problem or something or something will fail a gauge test. If this occurs don’t worry, take a deep breath, relax, clear your mind, and then get back into the task at hand. The purpose of the course is not to show you how "junky" your AR15 is. The purpose is to teach you how understand the rifle intimately and how to get it running properly. You are free to bring your own spare parts or, if available you can purchase parts on site with a Check or Cash if you wish to repair any problem during the course that you may encounter.


The Instructors may conduct a few “competitions” throughout the day and give prizes to the winners.


Questions are not permitted during active instruction. We will take short breaks between each topic to cover questions and answers. Write your questions down so when the Q&A begins, you have not forgotten your thoughts.


NO live ammunition is permitted! If you bring LIVE ammunition in the course you will be asked to leave. NO REFUNDS!


NO Pets are permitted! (Service Dogs are permitted, but they MUST behave)


NO audio or video recording devices are permitted. If you attempt to record and video or audio you will be asked to leave. NO REFUNDS!


NO cell or smart phone use allowed during instruction! You can bring a cell/smart phone to and inside of the course but it MUST be on silent/vibrate. I will NOT allow usage of cell/smart phones or texting during course. We will have periodic class breaks and phone usage is welcome during that time. If you have something important to use your cell/smart phone for during course you can go outside to text, email, instant message, skype, facetime, video chat, talk and the like. I WILL NOT permit phones to be out in the open during course.


The student understands that ALL materials and information is protected and copyrighted. The student agrees to not duplicate or copy ANY information provided in the class or reproduce the material for their own classes and/or instruction.


There are NO REFUNDS if you have an emergency and must leave course. Under LIMITED circumstances, I may waive fees to attend a future course. This is handled on a case by case basis and there are NO GUARANTEES.


There will be no discussions about how to violate firearm laws.


There will be no trash talk of Internet Forums, Instructors, Gun Shops, Armorers, or Gunsmiths. That is NOT the purpose of the course. We are here to show you “A” way to do things that was developed through professional Gunsmith experience with the AR15.  I encourage all of my students and prospective students to take other courses if they have the time and funds. As an Instructor and Gunsmith, I never stop learning and I encourage others to do the same.


This course is specific to .223/5.56 NATO, 7.62x39, 6.5 Grendel, 6.8 SPC, .300 Blackout, direct impingement AR15 firearms ONLY. This class is not about Gas Piston AR15’s, Blowback AR's (.22 Rimfire, 9mm, .40S&W, or .45 ACP), .308/Large Pattern AR's, or Big Bores such as .458 SOCOM, and .50 Beowulf. NO GAS PISTON AR's ARE PERMITTED!


This course is conducted in a single room so please be mindful of your personal hygiene. I urge everyone to shower in the morning before attending and wear comfortable and freshly laundered clothing. Please use deodorant, brush your teeth, and if you wear cologne or body spray please don’t overdo it. Students must keep their shirt and shoes on at all times.


All students MUST pay in FULL after registration. Registration requires students to complete the Electronic Enrollment Form. Students must also print and submit a Waiver to attend this course. You must present a valid identification when checking in for course. You CAN NOT attend this course if you are prohibited by any Federal or State Laws to possess a firearm, this includes mentally disqualified individuals. If you are under indictment for ANY crime that would prohibit firearm possession then you are NOT PERMITTED to attend. There will be Law Enforcement in attendance.


This class is a friendly environment and there are no "dumb questions". Please don’t feel intimidated.


This course is for Educational Purposes ONLY and does not grant certify anyone to be an Armorer or Gunsmith.




Mandatory Materials that Students MUST Provide for the AR15 101 ARmorers Course

-ONE, UNLOADED, CLEAN, and CASED, Direct Impingement AR15. (You may bring 2 additional Barreled Upper Receivers)

NOTE: If you have a HOME MADE AR15 you MAY bring it if was manufactured and is possessed LEGALLY

-A GOOD NIGHT of sleep and an open mind.

-NO AMMUNITION in Magazines, in the Firearm, in the Case, or on your person.

-When I say CLEAN, I mean degrease the gun completely and run a dry patch through the chamber and bore. DON’T clean ANY carbon. Bring a DRY and degreased AR15 (Use Gun Scrubber or Brake Cleaner). The firearm needs to be clean to properly use gauges.

-Case to Transport your AR15 from the Classroom to your Vehicle

-One AR15 Magazine (Maximum of 8)


Optional Materials that Students MAY provide for the AR15 101 ARmorers Course:

-Non Alcoholic Beverages and Snacks


-SPENT/FIRED BRASS fired from their AR15 for diagnosis

-Silencer/Sound Suppressor, please bring it so you can check it with the Class Suppressor Gauge. (Optional)


-Digital or Dial Caliper

-Seat Cushion

-K-Cup Pods (For your OWN use)


These are the Items that School of the American Rifle provides for EACH Bench:

NOTE: There are 2 Students to a Bench and you are NOT permitted to take these items home with you.

-Passwords for SOTAR Files/Manuals/Animation Software

-Emergency ONLY Medical Supplies (Boo-Boo Kit, Eye Wash Kit, Burn Kit, Bleeder Kit, Splint, Airway Kit)

-Wood Top Workbench

-Folding Chair

-4” Yost Vise with Anvil

-Vise Pads

-Bench Block

-Obsidian Arms Punch and Roll Pin Holder Set (Color Coded)

-Little Crow Gunworks Bolt Catch Installation Punches (Color Coded)

-AR15 Magazine Catch Tool

-Brass and Steel Punches

-4 Ounce Ball Peen Hammer

-Bolt Vise (Removing and Installing AR15 Ejectors)

-Wheeler FAT Wrench (Inch Pound Torque Wrench)

-Allen Sets (Metric, SAE and Torx)

-Tape Measure

-2 Pens (For Each Student)

-1 Pencil (For Each Student)

-Paper Towels

-Padded Work Mat (For Each Student)

-Magnifying Glass (For Each Student)

-Weed Eater Line (Gas Tube & Gas Key Gauge) (For Each Student)

-Washer (Checks for Magnetic Parts) (For Each Student)

-2 Chamber Flags (For Each Student)

-Finger Cot (For Each Student)

-2 Black Dunny Rounds (For Each Student)

-Mini Flashlight (For Each Student)

-10 EMPTY 5.56 Casings (For Each Student)

-1 Parts Bin (For Each Student)

-Pivot Detent Install Tool

-2 Bore Cleaning Patches (For Each Student)

-4 Cotton Swabs (For Each Student)

-33MS/Aeroshell Grease (Assembly)

-Synthetic Bearing Grease (Assembly/Lubrication)

-Oil (Assembly/Lubrication)

-Rocksett (Heat Resistant Thread Locker)

-Kroil Oil (Stuck/Seized Parts)

-Cold Blue (Steel Touchup)

-Aluma Black (Aluminum Touchup)

-Nyogel (Electric Contact Grease)

-Rubber Gloves (Medium, Large, and XL)

-Name Tag (Adhesive)

-Automatic Center Punch

-Slave Pins

-G.I. Multipurpose Brush

-Lens Wipes (Optics)

-SAE Allen Bit Set

-Front Sight Tool






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