One of my mean quirks is to tease him about the brand of axle grease in his hair, I recommend green grease, my favorite for everything. Not joke green grease is the bomb.
@@briankopp1369 frog 🐸 lube is supposed to be awesome.AND GREEN..LOL...do you know about lube and cleaner? I got some Cleanzoil and says is degreases.. but also say good for finish and mainly cleaning AND lubrication? Seems to work well, but kinda sounded contradictory
Caleb. Thank you for teaching me the things you've spent time learning over the years. This information is priceless and I think I can speak on behalf of almost everyone when I say that you are becoming a pillar in the industry.
I'm a new gunsmith, and your video help me learn do this. So thank you very much. My instructor showed us how to make make this tool, but he did not show us how to stake this part.
Just for added info, you should never use the Fix-It Sticks torque driver to loosen screws like he did. It messes up the torque settings and eliminates the warranty.
I was very impressed with that demonstration of how to correctly replace the gas key. I paused the video to go to the website and order the staking jig for myself. It seems like a common sense tool to have around if you enjoy working on and modifying guns as I do. Thanks again for the great demo!
Great video as usual, thank you- the other sealant often used while installing the gas key is Permatex Aviation Form a Gasket (#80019). Steer clear of getting anywhere near the gas hole with this sealant.
I just discovered that several companies make an adjustable AR-15 Gas Key and Brownells has one for sale. I would be very interested in seeing a video about these keys and what makes a good adjustable key specify how is the adjustment locked and secured to not move after it is set.
Say what you want to about bedding looser fit extensions.. it works. I only needed to do it once but an instant reduction in groups from 1.5-1.75" to 1" told me all I needed to know. Later used that (reputable higher end brand) upper in a different build and the barrel popped right out with a wooden dowell and a single smack with a mallet. It worked for the a Army Marksmanship Unit, and it worked for me. Then again I think you know this, you just like the free comment you get every time you mention it :-D You're right everywhere else on loctite though. It's important to remember that 638 and it's cousins aren't a threadlocker.. just a heat resistant "gap filler" Bubbas out there have defiled the Loctite name lol.
The barrel nut constricts the upper barrel channel around the barrel extension, much like a muzzle device will constrict the bore with higher torque..I have seen .003 constriction with 50+ barrel nut torque.. Considering most modern machined uppers are under mil spec 1.00 to +.002 and run tighter from .9990 to .9980, the mill spec barrel extension tolerance is .9987 to -.0008, the constriction itself is more than enough to stabilize the barrel..Throw in a thermal fit upper .9960 and it is quite redundant IMO to bed the barrel..Sloppy milled uppers is another story all together where shims come into play..The other side of the coin is it doesn't hurt anything other than making it harder to remove the barrel..
@@hairydogstail That one barrel/upper combo was the only one that "needed" it, and it certainly worked. With the number of manufacturers we have out there it's bound to happen eventually to anyone who builds enough guns. Handy trick to have in the toolbox.. plus if I need to tighten up a bearing on a piece of farm equipment I still have most of a bottle.
Don't worry, I didn't know we had so many Super Master AR Rifle builders in the U S. I am amazed at the number of people. Well I build rifles all the time, I have built thousands of ARs, On my next Super AR build I, On my last Super AR build, I only use Super part so and so on ALL my AR builds, Then the super list of ALL PARTS are listed down to the oil used when finished. Then there's the line of people standing outside their door, I need you to build me another Super AR, That's the best one ever. I can't believe retail stores are even able to sale ARs we have so many Super Master AR Builders. On my next build, On my last build.
Can you do a video on when it is appropriate to use Loc Tite on an AR? Larry Potterfield, the owner of Midway USA, who is a master gunsmith, put out a series of videos about 10 years ago on how to build an AR. He used Loc Tite throughout the build.
That's a really nice stone for that job. I might pick 1 up sometime. I use 620 locktite on my gas keys and break cleaner non c Version to clean Under the gas key dont forget the gloves.
Very good presentation. I had wondered what the procedure was for replacing a gas key correctly on an AR-15. Thank you. By the way, is that an AT-4 in the open locker in the background? I haven't seen one of those in years. Take care each of you!
I had a gas key come loose once. I retorqued them by feel and went over the stakes with a screwdriver ice pick punch thing i had laying around then marked the screws for future reference. Hopefully she holds but so far so good.
I’m looking at TM 9-1005-319-23&P, and there is not any thread locker specified. This does not mean that thread isn’t a good idea, however. There is a specification on staking, which calls for 0.025 inches, or less, of metal protruding above the surface. One thing I didn’t hear Caleb say is that carbon will create the final seal between the gas key and the bolt carrier body. If you have to manually cycle the first few rounds after replacing the gas key, that doesn’t mean you messed up. Give it up to 8 rounds before you decide that the replacement of the gas key is a failure.
Truing the carrier key removes the protective phosphate and is not necessary, nor mil-spec. Colt doesn't do it, FN doesn't do it, no major manufacturer does this. That's the whole point of the Permatex No. 3D Aviation Form-A-Gasket liquid. Also, the Key and Bolt Carrier Assembly Drawing 8448505 specifically states that the Form-A-Gasket is to be applied around the gas hole only on the carrier prior to assembly, not around the key screw holes (Note 2). Whether the method in this video is superior to the M4 drawing spec, and the millions of carriers that have been assembled accordingly, is up to you to determine.
So, serious question. You’ve put time and attention to making sure that the flat on the gas key is perfectly flat but done nothing to the bolt carrier, why do the work to the gas key? I know that the 638 takes up any gap, it just seems like paying that much attention to the gas key but not the bolt carrier is lost time.
I know you're not asking me, but in my admittedly amateur opinion, I would think if you want to regulate your gas pressure, you're almost always better off sticking with an adjustable gas block, just because it's much easier to access and make adjustments.
I hate to throw a negative comment on your video and alot of your other videos too but your cameramans recordings have a lot to be desired. He never gets up close and tight with his shots so everybody can see everything just like we all was therewith our eye's about eight inches from what your showing us what your doing ! He needs to get in there extremely close with the zoom lens so we can see and have plenty of light in the darkened areas too or your just waisting your time and ours too !
Mr. Caleb: Would you recommend DMT extra fine diamond stones for this leveling process? I know that the diamond stones are the most level surfaced materials made. And getting the bolt carrier group level is a must.
638 is anerobic. any thing exposed to air will not cure, its only good to 350f. im sure that key sees way higher temps than that when mag dumoing or even tust 30 round strings.
The gas key doesn’t get that hot. I’ve pulled the BCG out immediately after 2x 30rd dumps and I could handle it by hand. I don’t know WHY it doesn’t get that hot, but it doesn’t.
It's not perfectly flat, but it's flat enough that the Form-A-Gasket makes a seal around the gas hole. This truing of the carrier key is not necessary.
Yeah, but if it eases your pain, this one is non-serviceable. There is a ring in the bolt channel that tears up gas rings, so we had to decommission it.
