SLR15 AR15 / M16 / M4 / AR308 Armorer Course
When: May 1-2, 2023
Where: Depew, New York
We conducted a 2-day (16-hour) AR15 / M16 / M4 / AR308 Armorer course, that was hosted by the Depew Police Dept. This was our third time teaching courses here, and we look forward to more in the future. The training room was set up to allow plenty of table space. There room had a great projector system which allowed us to project some animated graphics of the weapons systems and powerpoint of detailed pics of gun parts, especially when looking at finer detail things like machining, stress cracks & wear.
The student base was a mix of Law Enforcement Officers from all over New York and Pennsylvania.
Rifles represented in this course were SLR15, Geisselle, Colt, Bushmaster, Sig Sauer, Windham Weaponry, BCM, Ruger, Daniel Defense, LWRC, Aero Precision, Palmetto, and a few custom builds.
Day-1 started the day by going through the course manual that all students are given. Students were supplied with their own set of basic tools that are necessary to do 95% of the work on their rifles (short of restocking and rebarreling, of which wrenches and sometimes fixtures are necessary), Slip2000 "EWL" Extreme Weapons Lubricant and #725 Cleaner Degreaser, etc. A short session of nomenclature was covered, at which time covered every feature and exterior piece of the rifle to include all the hidden design features that most people are not aware of, and everyone prepped the rifles for disassembly work. Everyone was taught the procedure series of checks that we recommend.
Everyone was taught our recommended way to field strip a rifle, and why we do it this way so as not to cause damage, premature wear or stress on anything. We covered maintenance of where and what to clean, and what needs lubrication to keep it running. We showed why not to use the firing pins as tools. We showed everyone our recommendation of how to remove fouling and why, and everyone got to use our methods.
The entire bolt carrier assembly was covered, to include inspections, maintenance, upgrades, 3 types of gas rings, and differences in finishing and machining. carrier key (gas key) installation and staking, ejector systems, etc. Everyone was introduced to the different types of gas rings. We went through what each types does, and their proper installation order. Bolts were fully gone through, which included extractors, extractor springs/inserts/O-rings. The ejectors were removed, cleaned, and inspected.
Note: Two people found that they had stressed ejector springs. We recommend that these be removed and cleaned on a regular basis, cleaned, inspected for signs of stress, and lubricated and reinstalled or replaced as needed. On suppressed rifles, these should be removed more often to remove the heavier fouling, and we often times see springs get shorter which we attribute to more heat that we see when shooting suppressed. We have seen these springs break down faster on suppressed rifles as compared to unsuppressed. The Officers in this case were supplied with new springs to get them back into service.
We got into the lower receiver assemblies, starting with the fire control group (trigger group). We teach this in a building block format, starting with baby steps of getting things out and in, then build into how things work. Everyone learned how to install and remove things so you don't cause damage. We went through detailed inspections of all the sear engagement surfaces, spring types, single stage, and two stage trigger systems.
Note: One of the rifles in this class had a Geisselle 2-stage that had a D-clip for the hammer pin instead of a J-spring. The Officer who brought it lost in, luckily we had an extra one and got him back into service.
At the end of the day everyone put their rifles back together, making sure that everything was in proper working order.
Day-2 started with a review of everything that was covered on day-1, with some greater details and myths covered. We then went back into trigger groups in great details, covering single stage, 2-stage, good and bad triggers, differences and options in spring systems, diagnosing problems when semi-auto turns into burst, and showing the differences in quality of triggers that are on the market. Once done with semi-auto trigger systems, we went into select fire trigger groups covering full-auto and burst trigger groups, to include replacement and diagnosing and repairs when experiencing malfunctions.
Everyone stripped their lower receivers, which allowed a chance for further inspections, and we went through a session on troubleshooting. Once everyone was comfortable with the entire lower receiver assembly, the were put back together, inspected, and made sure everything is in proper working order.
After trigger systems, we went through the rest of the lower receivers. Everyone had collapsible stocks. We covered the proper mounting & gauging, and proper castle nut staking on the collapsible stocks, and there were a few that had to be remounted to get them properly indexed, and a hand full of them needed to be staked.
We then got into a session on the timing. This is where we cover proper cycling, covering what effects timing, and how & what happens when it is out or proper time, dwell time, suppressor issues, etc, and how to get things into proper timing. This also led us into piston systems. We covered how the piston system works, break down and maintenance of the system (Yes piston systems do get dirty and have to be cleaned and maintained), how to properly adjust for timing changed, and trouble shooting. We also covered dwell time, and how it pertains to cycling issues, and hopefully got the point across of why we do not recommend barrel lengths shorter that 11.5" on unsuppressed rifles. During the timing session, we showed examples of adjustable gas blocks, and we also showed the gas control system from https://www.riflespeed.com/, which we like as it is adjustable with a quick turn by hand to one of the 12 different settings, and is well built for durability.
We showed how suppressors are properly mounted and gauged. Several people took advantage of the bore gauges that we make, and checked their alignment on their rifles that had suppressors.
Note: One agency had several suppressors in class that had been mounted using a crush washer, which made the suppressor off center enough that they had baffle strikes on all of them. Using suppressor bore alignment gauges that we brought, showed that these were mounted off center. We remounted them using shims, and things centered up just fine, but the baffle strike damage had already happened, this allowed everyone to see why we recommend that suppressors be mounted with shims and that they should always be gauged to check for proper alignment.
The last half of day-2 was spent on the upper receiver assembly. We covered barrel removal, mounting, fixturing, gauging & inspections. We show numerous ways to fixture a barrel into a vise, and our preference as to which fixtures/methods to use when and how. We showed how to mount, then properly torque and gauge the barrel system, which ensures it is in proper working order.
At the end of the day everyone put their rifles back together, everything was inspected and gauged to make sure it was in proper working order. Everyone did chamber inspections, checked & gauged the four gas seals, firing pin protrusion, trigger press, and headspace.Here is a brief overview of a few things that were covered:
History of the Weapon
Cycles of Function
General Disassembly & Assembly
Identification of Common Problems and Parts
Identification of Group Components
Semi, Burst, and Full Auto Parts and Conversions
Complete Armoring Disassembly / Assembly
Cleaning and Maintenance
Sight and Distance Considerations
Barrel: Twist, Length, and Profiles
Gas Systems & Piston Systems
Parts Interchangeability, including Brands
Firing Pin Protrusion
Chamber Inspection and Issues
Troubleshooting, diagnosis & repair
Gauging, Inspections, Stress & Interval Issues
Accessories and Customizing
Tool Options and Selection
SOP/MOD Accessories and Additions
Greg Sullivan "Sully"SLR15 Rifles DefensiveEdge.com