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Quoted:
So, this guy snuck a peak at the technical data package, copied down info, which he's not supposed to have, and passes off this info along with gauges to verify it, to students and private group members that have to sign paperwork legally making them accomplices or can be made to be accomplices to this stolen knowledge, and he does it in limited batches to limit his exposure along with charging a ton of money to further insure people are beholden to keeping their mouths shut? I think he is a competent qualified classic trained gunsmith that at somepoint in his life he took a specific interest in blueprinting AR-15s. I believe I have read somewhere he has worked on in some capacity over 10,000 AR15 rifles. Has he? Is that number real? Actually I can believe it probably is. During the course of those 10K rifles he used precision measuring gauges and pin sets to develop his own set of specs and philosphy of gauging, pinning and measuring on what should be what. He has sourced and bought a LOT of very RARE USGI military issued gauges. He is seriously into that. I think he is legit and his methods uniqely intersting and useful. That being said he has attempted to contact me thru youtube today, kinda of strange, possibly a poor attempt at "doxing me". I suspect he is doing that to try to find out who I am so he can ban me from his facebook page lol. He contacted me asking why I took down my grand total of three 1 minute mostly useless videos that was personal stuff, nothing nobody would even want to watch. I suspect this doxing effort escalates. That would be sad. Then again it could be completely INNOCENT, (and I am not ruling that out) but the content of the videos I had posted and only 3 videos at that makes me suspect. I hope thats not who he is and am holding out thats the case. I can post screen shots to back this up. |
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Quoted: NO, I dont think he did all that. I think he is a competent qualified classic trained gunsmith that at somepoint in his life he took a specific interest in blueprinting AR-15s. I believe I have read somewhere he has worked on in some capacity over 10,000 AR15 rifles. Has he? Is that number real? Actually I can believe it probably is. During the course of those 10K rifles he used precision measuring gauges and pin sets to develop his own set of specs and philosphy of gauging, pinning and measuring on what should be what. He has sourced and bought a LOT of very RARE USGI military issued gauges. He is seriously into that. I think he is legit and his methods uniqely intersting and useful. That being said he has attempted to contact me thru youtube today, kinda of strange, possibly a poor attempt at "doxing me". I suspect he is doing that to try to find out who I am so he can ban me from his facebook page lol. He contacted me asking why I took down my grand total of three 1 minute mostly useless videos that was personal stuff, nothing nobody would even want to watch. I suspect this doxing effort escalates. That would be sad. Then again it could be completely INNOCENT, (and I am not ruling that out) but the content of the videos I had posted and only 3 videos at that makes me suspect. I hope thats not who he is and am holding out thats the case. I can post screen shots to back this up. This whole thing would be an awesome 80's movie. |
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Quoted:
I wondered why you deleted your previous post explaining how to get the gauges for free yourself and even posting a pic with a clue in it. This whole thing would be an awesome 80's movie. But his contacting me thru youtbe about 3 useless 1 minute videos I took down was kind of strange. One video was about a colt upper I actually started a thread on this forum about, the other was a short vid on a Osprey Defense gun firing in slow mo and the other was a Sig 750 at a range. Nothing threre he would be interested in, he was interested in something else... But then again I am not going to judge the guy, like I said I admire his work, and it all could be innocent. Thats what I am hoping it is. |
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I've been attempting to identify dimensions to use in evaluating the condition of a BCG. So far, I have only found that the firing pin hole should be between Carrier keyway, min/max Inside of bolt carrier where bolt rings are, min/max Inside of bolt carrier in front of area where rings are, min/max bolt tail diameter, min/max Thanks all. Edit 02/27/2020: I'm not comfortable with the specs show above, hence the strike through. The Army's gauge, PN 12620101, for the firing pin hole size, looks to be 0.070. Also, I checked a brand-new bolt and the firing pin hole is larger than 0.060 (I used a 1/16" twist drill). Bolt tail is .2503 +/- .0002 Major diameter of gas key is .172 +.005/-.000 EDIT, this is a two step hole, with a reduced bore where it approaches the angle, the major dimension where the bulb head of the gas tube fits is in fact .1805 -.0000/+.0008 The dimension at the start of this line is actually that reduced dimension......I'm old and it has been a long day.... 
Piston area.......................... Machine after hear treat .500 +/-.0010 Min diameter after finish .4984 in front of piston.................. Machine after heat treat .5315+/- .0010 Min diameter after finish .5299 These are for a chrome plated carrier with a chrome plate thickness of .0002 to .0003 |
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Quoted:
So, this guy snuck a peak at the technical data package, copied down info, which he's not supposed to have, and passes off this info along with gauges to verify it, to students and private group members that have to sign paperwork legally making them accomplices or can be made to be accomplices to this stolen knowledge, and he does it in limited batches to limit his exposure along with charging a ton of money to further insure people are beholden to keeping their mouths shut? |
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Quoted: You echoed every thought I have about SOTAR. Bravo |
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Quoted:
Ain't a secret no more. Quoted:
Quoted:
So, this guy snuck a peak at the technical data package, copied down info, which he's not supposed to have, and passes off this info along with gauges to verify it, to students and private group members that have to sign paperwork legally making them accomplices or can be made to be accomplices to this stolen knowledge, and he does it in limited batches to limit his exposure along with charging a ton of money to further insure people are beholden to keeping their mouths shut? |
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Quoted: The actual spec on the firing pin hole off the print is .0635 +/- .001 Bolt tail is .2503 +/- .0002 Major diameter of gas key is .172 +.005/-.000 Piston area.......................... Machine after hear treat .500 +/-.0010 Min diameter after finish .4984 in front of piston.................. Machine after heat treat .5315+/- .0010 Min diameter after finish .5299 These are for a chrome plated carrier with a chrome plate thickness of .0002 to .0003 Your Gas key spec is wrong, As for the rest, .............your getting very very warm. |
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As for people making fun of Instructor Chad for using weed eater line, I think your missing the big picture.
He uses loctitie to make a gasket when replacing a gas key and there is some small chance some loctite might get squeezed into the gas key hole when tightening down the carrier key. He is using the weed eater line to ensure that the loctitie isnt blocking part of the gas port under the carrier key. Not seeing what that use of weed eater line in that case is cause for ridicule. |
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Quoted:
Damn, can't download because the twitter account is suspended, thank you for trying though! That thread has a link to the github page with the fosscad megapack, it's got the TDP in it too. |
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Quoted:
https://ivanthetroll.keybase.pub/tdp.html That thread has a link to the github page with the fosscad megapack, it's got the TDP in it too. Quoted:
Quoted:
Damn, can't download because the twitter account is suspended, thank you for trying though! That thread has a link to the github page with the fosscad megapack, it's got the TDP in it too. |
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That looks legit for the M16A1/A2. Download while you can and THANKS!
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Quoted:
As for people making fun of Instructor Chad for using weed eater line, I think your missing the big picture. He uses loctitie to make a gasket when replacing a gas key and there is some small chance some loctite might get squeezed into the gas key hole when tightening down the carrier key. He is using the weed eater line to ensure that the loctitie isnt blocking part of the gas port under the carrier key. Not seeing what that use of weed eater line in that case is cause for ridicule. If I was going to comment on youtube videos a weed eater string probably would not even make the list. https://www.brownells.com/gun-cleaning-chemicals/brushes-amp-bore-snakes/specialty-cleaning-brushes/super-duty-pipe-cleaners-prod1715.aspx |
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Quoted: That firing pin spec seems right as all of my new unfired bolts will accept a .063 pin, but not a .064 pin. Your Gas key spec is wrong, As for the rest, .............your getting very very warm. should be .1805 -.0000/+.0008  , I posted the smaller of the two dimensions shown for the hole in the gas key, and I know I'm on the rest.... took them from the prints., the set I have are dated 2002 on the carrier, key and bolt
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Quoted:
You are right about the gas key...there are two dimensions for the channel.....drawing is busy and my eyes are old and tired should be .1805 -.0000/+.0008 , I posted the smaller of the two dimensions shown for the hole in the gas key, and I know I'm on the rest.... took them from the prints., the set I have are dated 2002 on the carrier, key and boltInstructor Chad states in the comments of this video what the specs are on his gas tube go / no-go gauge. These are no secret. Scroll down in the comments where Instructor Chad replies to Blackcloudr1 for the specs. So I didnt tell anyone, Instructor Chad did. https://www.youtube.com/watch?v=xKyFt3xQC9E&t=328s |
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Quoted: Very good sir! Instructor Chad states in the comments of this video what the specs are on his gas tube go / no-go gauge. These are no secret. Scroll down in the comments where Instructor Chad replies to Blackcloudr1 for the specs. So I didnt tell anyone, Instructor Chad did. https://www.youtube.com/watch?v=xKyFt3xQC9E&t=328s
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They do have an army armorers document on how to check over your AR15 rifle for unusual wear and tear. I don't know if you can post PDFs so excuse me if this is not allowed but here's the link: http://pdf.textfiles.com/manuals/MILITARY/Army%20M16A2%20and%20M4%20manual.pdf The army manual is ARMY TM 9-1005-319-23 and you can buy it from Amazon. I also recall H&K released a document on their 416 line up as a notepad style manual. I was planning to get it but never did so I can't tell you. I don't know if anyone posted it yet, and I made a post earlier but I haven't thought of this then. |
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Quoted: You're not going to run into dimensional wear issues on a BCG, that's not a typical failure mode. You should instead be checking for cracks on the bolt lugs, at the cam pin hole and making sure that your gas rings are still sealing. Quoted: You're not going to run into dimensional wear issues on a BCG, that's not a typical failure mode. You should instead be checking for cracks on the bolt lugs, at the cam pin hole and making sure that your gas rings are still sealing. ^ this. You will likely severely wear the upper receivers bearing surfaces and charging handle notch etc. well before you even get close to wearing out a carrier. Bolt? As posted above; inspect your lugs, cam pin hole, gas rings and check headspace periodically. Quoted: a dye penetrant kit for crack detection. +1 magnaflux kit and headspace gauges are the only "gauge/wear" detection items that would actually be usefull in real life. |
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Quoted: I've been attempting to identify dimensions to use in evaluating the condition of a BCG. So far, I have only found that the firing pin hole should be between Carrier keyway, min/max Inside of bolt carrier where bolt rings are, min/max Inside of bolt carrier in front of area where rings are, min/max bolt tail diameter, min/max Thanks all. Edit 02/27/2020: I'm not comfortable with the specs show above, hence the strike through. The Army's gauge, PN 12620101, for the firing pin hole size, looks to be 0.070. Also, I checked a brand-new bolt and the firing pin hole is larger than 0.060 (I used a 1/16" twist drill).  Lots more to follow. |
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I’m the OP and even though I checked out of this thread, I saw a recent post that bumped the thread and thought I would update with a summary of what I have collected from those that have posted with useful information and references to sources such as the Army’s TM. First, though, many thanks to those that contributed their knowledge and expertise. Second, even though I have referred to “minus” and “plus,” I’m not 100% certain whether to use “minus” or “plus” gages but have mentioned whether a minus or plus may be called for. Also, I would welcome any input, corrections, or suggestions. Carrier key: To gauge the inside of the key where the bulb on the end of the gas tube goes, use a .180 zz minus pin gage as the “GO” and a .182 zz minus as the “NO GO.” The manufacturing blueprint (print) has the spec as .1805 - .0000 +.0008. “Instructor Chad” has the .180 and .182 in a comment section as mentioned in a post above. Firing pin hole: Use a .0625 pin gauge (I believe a “minus”) to test the minimum hole size “GO” and use a .0645 (I believe “plus”) as the “NO GO” for both a new bolt and a used bolt. The print has the spec for a new bolt as .0635 +/- .001 and, according to a White Oak Armament newsletter, they discard a bolt if the .0645 pin gage passes through (no reference to whether they use a “minus” or a “plus”). The Army’s NO GO gauge, PN 12620101, appears to be .0702 (which I believe would be a .070 zz plus pin gage). What WOA wrote seems to be a very tight tolerance given the Army’s NO GO gauge but I will trust what WOA wrote and use a .0645 zz plus as the NO GO. Firing pin protrusion: Min .028 and the max is .036 (I think this was from the Army’s TM). Bolt tail: The print has the spec as .2503 +/- .0002. According to the same WOA newsletter, a new bolt should have a tail not less than .2503 and for re-barrel purposes, WOA culls the bolt if less than .2499. According to WOA, “too small of a stem is a much overlooked cause of short cycling in the AR platform.” Inside of carrier where bolt tail rides: I haven’t been able to decipher the print for this. I can say that on both a new DSA and an RRA bolt carrier, a .251 zz minus will pass but a .252 zz minus will not. For the time being, and in the absence of other information, I will use these two as my GO and NO GO (in part because I already have them). Piston area of carrier: Print has .500 +/- .0010 with a min diameter after finish of .4984. Seems to me that a .499 zz minus to test a new carrier (GO), and a .502 zz plus as a NO GO. I did not find anything about GO or NO GO for this aspect but these numbers make sense to me. Carrier in front of piston area: Print has .5325 +/- .0010 with a min diameter after finish of .5299. I’m not sure I will test this nor am I sure of what specs to use to gauge wear, but may use a 531 zz plus for a new carrier, and .533 and .534 to see if this area has worn. @the_AR-15_Junkie has a nice setup. |
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Bolt tail: The print has the spec as .2503 +/- .0002. According to the same WOA newsletter, a new bolt should have a tail not less than .2503 and for re-barrel purposes, WOA culls the bolt if less than .2499. According to WOA, “too small of a stem is a much overlooked cause of short cycling in the AR platform.”. Bolt tails Gauges, you can buy these from McMaster Carr. .248 Field .2496 NO GO. More to follow. 
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Quoted: @the_AR-15_Junkie has a nice setup. Thats not my setup in that pic I posted, I lifted that photo from the facebook page from one of the students. All the pin gauge sizes can be easily see on the gauges. My setup is better, much better. I never just copy other peoples work directly, I vastly improve on it so its really different and better from the original. Thats what I do for a Fortune 500 company I work for. I am a product development specialist. |
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Quoted: What is the round count on this carrier? If the answer is less than 50k and it functions reliably, I wouldn't worry about it. Hell, even if it's above 50k I wouldn't really worry about it... inspect it occasionally, replace the bolt components and/or bolt as needed and go about your business. The carrier isn't really a component you're likely to wear out. This, not sure how you could wear out a carrier. The gas rings on the bolt are sacrificial, softer than the steel in he bolt and carrier and designed to wear out without damaging other components. Extractor and ejector, and related springs, are the same. The bolt logs take a beating but should last many thousands of rounds, and you'd replace with the barrel anyway. |
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