With some of the criticism about YHM quality that was discussed in recent threads, I thought I’d contact them to inquire about their BCG’s to see if they are HP/MPI tested. Rob’s chart doesn’t reference YHM, so I sent him a message about the possibility of updating the chart with his specs. Hopefully YHM will comply with his request for info, so we can get a complete picture. So in the meantime, here’s a copy of my email and the reply from YHM.
Sir,
Yes, we actually purchase them from Stag Arms. I believe they are both HP
and MPI tested.
Hi. I was looking on your website for a Bolt Carrier Group and noticed
your company sells Mil-Spec BCG’s. Can you tell me are your BCG’s tested
for high pressure (HP) and Magnetic Particle Inspected (MPI)?
So as it turns out the BCG’s are made by Stag. So a quick check of Rob’s chart would indicate that their BCG’s are HP/MPI tested. I happen to own this BCG and I will say the staking is very good, compared to others I’ve seen.
Anyway…so for those who are wondering who didn’t know, we now all know that YHM BCG’s=Stag Arms. That was news to me.
i’m sorry, not trying to bash but if a company states that they “believe” it is without a definitive “yes” or “no” they do not know their own product.
There is no need to re-invent the wheel here, there is criticism of YHM due to the fact of that the Senior members and most others here Know what is quality and what is not. Spend some time looking at the stickies and you will have a better understanding. good luck
Yeah…I agree on that point. “I believe” ranks right up there with “it should be” or “I think so.” No doubt lots of good information on this site and I’m learning more as I go. I discovered Rob’s chart this morning which was a real eye opener. That’s a good reference tool to have without argument.
Thanks for the info Grant. That’s exactly what I said though. I mentioned Stag + BCG. I figured for the extra $75 or whatever it is Stag charges, that was for the MPI/HP testing. However, I just looked at the BCG a little closer and compared it to my Bravo Co BCG and the Stag Arms BCG doesn’t have any HP/MPI markings on it like the Bravo Co BCG does. So either mine wasn’t tested or Stag doesn’t mark them as such. Your thoughts?
Stag produces tested and non tested BCG’s. The tested BCG’s are available as an upgrade on “their” rifles as part of their plus package. Your YHM Bolt is not tested…which is why the guy didn’t tell you flat out that it was.
Still trying to make that square peg fit the round hole are you
Your last thread was closed for a reason and then you start this one. Do you think that some person who answers phones at that company or a majority of others know these answers?
No, most don’t. They don’t know better and most companies have no idea because they are simply peddling someone elses’ wares (as you have found out).
For what you paid for that BCG you could have purchased an LMT and for a few dollars more a BCM or DD. In which case their would be no doubt. You can even go to their websites where they CLEARLY (last time I checked) list the specifications of their BCG’s.
I am sorry that you didn’t get better info sooner. However, unless you are willing to take the entire upper and rail and sell it off you are simply trying to validate your purchase.
You know, if people would actually buy decent products–Colt, Daniel Defense, BCM, LMT, etc–and not try to insist that such and such brand is “just as good”, we would have a lot less threads on this board.
Well, anyway, that’s one of the reasons that we are here.
Quality Control isn’t just a good thing- it’s absolutely necessary. Without good QC, the product, regardless of what it is, will either be complete garbage, or it’s quality will be out of control. QC is in the hands of those who make the product and is the result of their pride in workmanship, manufacturing processes and corporate culture, not those who inspect it.
HPT/MPI does not control quality, it assures the quality (inspection of product is Quality Assurance) and tests only a small aspect of it. With excellent QC, HPT/MPI of the bolt and barrel wouldn’t be necessary.
In fact, HPT/MPI is only needed to assure the quality of bolts & barrels made by processes that are not completely in control of the quality. The less control a manufacturer has over quality of their bolts and barrels, the more important HPT/MPI becomes
Sooo…this begs the next logical question. If I were to sell the upper, what could I reasonably expect to get out of it? Second question, what about the YHM lower? No issues with that then? I’m using a DPMD LPK by the way.
I have an opinion that a HPT & MPT is not that big of a deal based on years of experience of doing non-destructive testing and examination of high pressure piping systems. Not exactly a rifle bolt, but similar testing methods (and probably technicians too). Ensuring material specification, acceptable dimensions, hardness/ heat treat/ stress relief are much more important to verify than if someone shot it with a hot round and then magged it. I do agree that if those steps were skipped, whoever is selling those bolts is not interested in the best quality.
I didn’t say anything about what the OP paid for the bolt and I didn’t read the other thread, I just threw out an opinion of HPT/MPT.
ETA: I want to make myself clear that I’m not trying to change anyone’s mind on NDE of gun parts or question what a person wants out of their parts. I just threw an opinion out there earlier and it wasn’t meant to contest any of the knowledge here. I’m a picky cuss myself and I ain’t happy with anything less than a known brand HPT/MPT bolt ridin’ in a full-auto carrier.
All I know is I ordered a barrel from them that they claimed was 4150 vanadium yet later I found out it was 4140 steel, their “tech” people had no idea and told me what they thought I wanted to here. After a few email exchanges the owner contacted me to say that I may return the used barrel for a full refund including the shipping which was great on his part so atleast he was about customer satisfaction. He went on to say that their webmaster would be changing the misleading info on their web page. I don’t know what to make of whAt they claim from that experience, I have a diamond rail that I like though it may not belong on a “fighting gun”
