What the John Williams Stoner Wiki Actually Is
The John Williams Stoner Wiki is a community-maintained reference document focused on the Stoner firearms platform, particularly the AR-15 and ACR/Mk 18 MOD 1 systems designed by Eugene Stoner. It covers mechanical specifications, parts compatibility, machining tolerances, and field modifications. It isn't an official Armalite or Stoner Industries publication. It's a living page where rebuilders, machinists, and former military armorer types post working data that never made it into the factory manuals. I ran into this page about three years ago while trying to sort out a gas key staking issue on a custom upper. The Mil-Spec drawings you get from the government contracts are fine for baseline parts, but they don't tell you what happens when you're running a 16-inch barrel with a mid-length gas system and a heavy match trigger group under sustained fire. The John Williams Stoner Wiki had forum-linked posts from people who had actually disassembled bolt carrier groups after 3,000 rounds and measured the wear patterns. That kind of data doesn't appear in any catalog. The page organizes information into sections covering the STONER 63 system, the AR-15 platform lineage, buffer weight calculations, and aftermarket receiver dimensions. Some of the content is outdated because it hasn't been revised since around 2019, and a few of the machining diagrams reference parts that got discontinued when Knight's Armament shifted production lines. The value is in the cross-references between posts, where someone will link a thread about headspace gauges to another thread about barrel nut torque specs, and suddenly you've got a complete procedure assembled from eight different contributors.
How to Navigate It Without Wasting Two Hours
The layout isn't intuitive. The main entry point for the John Williams Stoner Wiki is through a Wikipedia-style index page, but the actual technical threads are scattered across sub-pages that aren't well-linked from the front matter. My approach is to start at the STONER 63 parts diagram section, use your browser's find function to search for the specific component you're working on, and then trace the discussion threads backward to find earlier posts where people identify the root cause of failures. Going forward through the threads usually just reproduces the same guesses. One thing the wiki doesn't make clear is which posts are verified by people with machining experience and which are just people repeating what they read somewhere else. I learned this the hard way after I followed a recommendation to use a specific barrel nut wrench technique and ended up cross-threading a lower receiver. The workaround was straightforward: I posted the exact serial number of the upper I was working on and asked for confirmation from anyone who had actually done the procedure on that receiver lot. Three people replied with photos of their own work showing the correct alignment marks. That's how you separate usable advice from confident guesswork on that page.
What the Page Gets Right and Where It Fails
The buffer weight charts are reasonably accurate for standard builds. If you're running a 4150 steel barrel between 14.5 and 16 inches with a mid-length or game-day gas system, the recommended spring weights and buffer types track closely with what actual firing data shows. The section on STONER 63 magazines is less reliable. Multiple contributors have posted conflicting capacity numbers, and none of them seem to have tested the variants side by side under the same conditions. Another area where the wiki falls short is on the newer ACR variants. The original STONER 63 documentation is thorough because it was based on actual military contract data. The AR-15 sections are solid but generic. The ACR parts compatibility charts are where things get sloppy. People post photos of parts that fit their gun and assume universal compatibility. They don't account for the differences between the Magpul version, the FN version, and the Knight's Armament remanufactured units. If you're working on an ACR and you find a parts list on the wiki, verify the manufacturer and variant before you order anything.
Get the Full Details
Practical Use Case: Determining Gas Tube Length
Say you're building an AR with a 10.5-inch barrel and you need to figure out whether a carbine-length or a pistol-length gas tube is going to work without excessive carbon buildup. The John Williams Stoner Wiki has a thread where someone measured gas pressure at the bolt face using a piezo sensor across five different gas tube lengths on that exact barrel size. The data showed that a pistol-length tube on a 10.5-inch barrel with a 0.062-inch gas port pushes the cycle speed into a range where the bolt carrier group starts slapping the receiver extension hard enough to accelerate spring fatigue. A carbine-length tube with the same port size kept the cycle within acceptable parameters and reduced carbon furring on the gas key by roughly 40 percent over a 500-round session. I used those measurements as a starting point and then adjusted the gas port size down to 0.055 inches because I was running a drop-in trigger and didn't want the hammer bounce I was getting with the standard setup. The wiki didn't have that specific combination documented, but the methodology of using measured pressure data instead of guessing from a chart is what makes the resource useful. Most people skip past the raw numbers and go straight to the conclusion, which is why the practical value gets lost on casual reads.
Accessing the Resource
You can find the John Williams Stoner Wiki by searching for it directly in a search engine. It's hosted on a Wikipedia-compatible platform and doesn't require an account to view the content. Editing is open, which is both the strength and the weakness of the whole thing. The page exists because people who actually work on these firearms contributed to it over many years, but it also means the information quality varies significantly between sections and no single person is responsible for keeping everything accurate. If you're doing serious work on a Stoner-platform firearm, the wiki is worth keeping bookmarked. It won't replace a proper manual or a conversation with someone who has disassembled the exact configuration you're building, but it will give you data points that you won't find anywhere else. The buffer weight tables, the headspace discussion threads, and the STONER 63 parts cross-reference charts are the sections I return to most often. The rest of the page is hit or miss depending on how recently anyone has updated it.
