Team, I thought I would run this by you and ask your thoughts on this and if I have done something to cause this failure and if so what, so nobody makes the same mistakes.
So I got in touch with Miguel regarding the scoring that happened whilst using my Hao Econoline REBCG bolt carrier.
This is a fairly large bit of e mail tennis here but if you own a Hao bolt I think it is worth your while to read as the way I have understood it is if you have aftermarket parts on your replica and you have a problem with your bolt they can't help and I believe one other on here has, so if we can figure out what went wrong we can save a buffer tube here and there!!!
So crew, what are your thoughts on this as I cannot think of anyone buying this bolt to put in a vanilla Mws?
Here is what I've emailed and the response:-
Hi,
Hope you are all well, unfortunately me and one other on the mws forum have developed a fault with our bolts damaging the internals of our mws's.
Much as it pains me to say this as I really love my Hao bolt it has started to create some significant scoring damage to the inside of my buffer tube and upper receiver to the point where I've had to replace my buffer tube and stop using this bolt. Although the dimensions seem relatively close to the original bolt for some reason the roller has scored the lower part of the back of the upper and the buffer tube for which I have had to replace, please see attached photos.
I believe however through a slight modification of a smaller diameter roller wheel would help with this problem rather than a complete redo of the whole bolt.
I hope you can help with this as I really like the look and the lightweight action of this bolt.
Many thanks.
Matt Kills him
Dear Mills,
Sorry for the inconveniences.
Id like to know first some of the various in this build ?
What receiver and buffer tube are you using ?
Yours sincerely,
Miguel hao
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And also the buffer
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Service Hao <
[email protected]> 於 2021年4月26日 週一 11:11 寫道：
Hi Miguel,
OEM TM lower, upper, charging handle and buffer were used but after scoring appeared I black permanent markered the scoring and tried different nozzles (as I thought they may change the angles of the bolt + checked the buffer tube wasn't cross-threaded). I tried a g&p aluminium buffer with a dollar coin and faucet washer in the buffer tube (as I was told it may be caused by over- run) I have recently bought a g&p roller weight but that has arrived too late for this buffer tube each time blacking out the scratch and going again, in the end I just stopped using it and went back to the TM original.
I have bought a second hand tube from the afuk TM Mws thread guy Wolf for next to nothing so that's all good, but would like to get this bolt working for winter or for a nozzle spring failure mid game.
Cheers
Matt Mills
Dear Mills,
We are still figuring out what might cause this problem as our own testing sample don't have such significant wear off .
Also, we noted that per your photo shows the wound on the lower receiver which should caused by the over run bcg hitting the receiver. This shouldn't happened if it's the oem marui buffer tube or product of ours .
BR,
Miguel
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Yep,
Hence the dollar coin and faucet washer now and the reason I don't run a magpull b a d lever with a standard bolt catch plate anymore (c&c maritime bolt catch and g&p lightweight bolt catch plate now) as you have to unwind the buffer tube so much to give the plate time to catch the bolt you end up increasing travel allowing the gas key securing screws on the top of the bolt carrier to catch the top of the lower receiver and crack it. This is prior damage to my Hao bolt days and does not affect it. If you look at the pictures you will see the buffer tube is wound right in with 2 threads remaining so this is no longer an issue.
Hope this helps.
Cheers
Matt
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Since you have mentioned . We also have the bolt stop plate for this situation as when we developed the 416C mws kit. We were facing a really short travel for the bcg so we made the plate to catch the bolt with a really short travel space of the collectible collapsable stock fyi .
https://www.haoptwart.com/product-page/hao-s-light-weight-bolt-stop-plate-for-marui-mws-z
So, the nozzle and the buffer tube are all oem while this happening ?
Long story short is that our parts should work under fully oem situation and we are not sure how it works with parts fr other manufacturer. You have listed pretty much combination so I got a little confused .
BR,
Miguel
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Miguel,
I understand your position and I agree I have made my mistakes on this rifle which is why I have reverted it back to original parts for testing - I think the problem I'm having is the profile of the bolt roller wheel being a bit sharper around the edges?
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Dear Mills,
All in all, we can't promise compatibility with other third party manufacturers' products .
Our parts are precisely made and tested under fully OEM/HAO's build.
Many manufacturers from China/HongKong may not well tested their product before release and the tolerance issue might also be a thing for them.
We only have this issue heard from you (and the one you mentioned in the first email ) for now. Other than that, everything is fine for the hundreds of it we sold.
We also ran some testing yesterday, nothing noticeable.
So we don't think there's problem with the bolt for now.
If you still have this issue even under a fully OEM build we are happy to exchange you for the bolt.
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