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#201 ·
I have found a company in the UK which will make Silicone Rubber Peristaltic Pump tube (For that is what the McMaster-Carr stuff is I believe) to order: ID, OD and hardness. They can do Shore 70A. They have sent me a sample of 65A tube of 6mmIDx9mmOD (1.5 wall) but I haven't had a chance to do anything with it. Going to pass it to a mate who is good at R-Hops and see how he gets on with it. If it is OK Could order a roll of custom tube but it would be a MOQ of 50m so wouldn't be cheap (comparatively) but wouldn't be hugely expensive either.
 
#202 · (Edited)
Thanks Cetane. I still have a problem as it's for an AEG (around 320fps), and I don't think it will work very well with very heavy BBs. The material should be hard enough not to overhop a .28. If I use soft tubing it will probably overhop.

Mike, if the minimal order quantity is 50m maybe some of us could get together and order something like 10m each (so we would be 5, which given the circumstances I think is realistic) and have it shipped directly from the company. What do you think about that? Do you think the company would be willing to do so?

Edit: More info and ortographic mistakes.
 
#203 ·
Evening All,

Sorry for the horrific necroposting but I didnt want to start another thread, I ordered some tubing the correct size to R hop my AEG (Before I attempt it on my VSR) and the description said it was a silicone hose but now it's arrived its much stiffer than I expected and I would describe it as a slightly flexible plastic more than silicone. It is very smooth and has little give.

I'm assuming this will not be suitable?

Again, this is my first post so sorry for the necropost but I didn't wanna be the new guy starting a whole thread for that question ha!

Thanks
 
#210 ·
Yeah silicone tube was what I ordered last time but it was way stiffer than a bucking type material, more like a PVC and nothing like peristaltic pump tube as mentioned above

Sorry for being a pain if I'm posting too much I'll just order a few and crack on
 
#211 ·
#213 ·
No sorry it was a mistake on my part, I got in touch with the company I ordered the silicone tube from through amazon and it turns out they did send me PVC tube by mistake.

Hence my confusion as to if it was the right stuff and my wondering if more silicone tube would be the same!

They are sending me the correct tube out now and when it gets here I will be sure to update on how it goes.

Can I just say a massive thanks for all the help considering they were pretty silly questions, much more helpful and receptive than some forums I've been on!
 
#214 ·
Hi Colleagues airsofters )
I'm outside of US (Im in Ukraine) and definitely do not have "access" to McMaster store ((
I've tried different combinations of ID/OD 6x9 and 6x8 some of them I ordered locally in Ukrane, some on Aliexpress and eBay.
The most problematic thing is that all of them were parts of either food or medical branches and had hardness of ~ Shore A 60, which is extremely difficult to send/file.

The problem that I stick is which glue do you use to glue patch into barrel window?
The reason why I'm asking is that the patch ALWAYS being ripped-off while I was trying to make OD close to barrel OD.

I've used Super Glue and Silicone RTV gasket maker (both of them do not work for me).
Thanks in advance for any help.
 
#215 ·
I use EPDM rubber hose, the sort used on the heater systems and oil lines of cars. It's cheap (really cheap), you can get it from most auto stores and it works.
With sanding the OD to size the is a bit of a technique. I had the same problem with the patch pulling out until I worked it out. Make sure you have something that is a snug fit in the bore under the patch. Whatever you used to fit it will do. Don't sand along the axis of the barrel. Start at the top of the patch in the middle and sand gently using 240 grit, towards the edge of the patch, not backwards and forwards, just in one direction and in one spot until you're flush with the barrel. Now move slightly towards the edge of the patch in the direction you are sanding and do the next bit. You'll get a short of rough stringy bit of the patch material coming off where you're sanding. Sort of 'chase' this to the edge of the patch as you gradually sand it down. Then start at the top again and do the other side. The first couple of times you do a patch you might have to repeat this a few times until you're happy, but with a bit of practise it takes about 5 minutes to do . Once you're satisfied it's all flush polish it up with a bit of 600 grit so it looks pretty.
I tried RTV without a lot of success so I went back to super glue. I use the stuff that kitchen fitters use. It's thicker, stays where you put it, will fill small gaps and comes with a spray can of activator that sets it off instantly. Just put a tiny amount on the very outside edges of the window so it doesn't get in the bore, and once you're done slide a razor blade down the front and back edges to check it's not stuck to the barrel where it shouldn't be.
 
#216 ·
Link0r said:
Hi Colleagues airsofters )
I'm outside of US (Im in Ukraine) and definitely do not have "access" to McMaster store ((
I've tried different combinations of ID/OD 6x9 and 6x8 some of them I ordered locally in Ukrane, some on Aliexpress and eBay.
The most problematic thing is that all of them were parts of either food or medical branches and had hardness of ~ Shore A 60, which is extremely difficult to send/file.

The problem that I stick is which glue do you use to glue patch into barrel window?
The reason why I'm asking is that the patch ALWAYS being ripped-off while I was trying to make OD close to barrel OD.

I've used Super Glue and Silicone RTV gasket maker (both of them do not work for me).
Thanks in advance for any help.
Click to expand...
Здравствуйте, fellow Ukrainian!
I am rusty in my writing, but I can fully speak it and read it.
Anyways, I believe you can order McMaster tubing online.
Some people do not even glue the r-hop patch down, and just put a bucking over it.
If you would like glue, I am not sure how to help you here. I will leave my r-hop patch "floating."
 
#217 ·
Hangtight said:
I use EPDM rubber hose, the sort used on the heater systems and oil lines of cars. It's cheap (really cheap), you can get it from most auto stores and it works.
Click to expand...
Hangtight thank you for another sort of material to try with I guess it might work for my M4 build.
Here in Ukraine we have limit 815 FPS for sniper rifles (with shooting range limit of 65 Feef of course) so I have doubt that EPDM will work properly on a such high speeds like > 800 FPS because it has hardness only Shore A60 , may be just only for machine-guns which have limit of 525 FPS. Please correct me if I'm wrong here, you have more experience with EPDM but I can only guess.
Anyway I'm looking for something close to "High-temperature silicone rubber" which is near to Shore A60 in hardness but still have good enough adhesion ability.

Hangtight said:
Don't sand along the axis of the barrel. Start at the top of the patch in the middle and sand gently using 240 grit, towards the edge of the patch, not backwards and forwards, just in one direction and in one spot until you're flush with the barrel. Now move slightly towards the edge of the patch in the direction you are sanding and do the next bit. You'll get a short of rough stringy bit of the patch material coming off where you're sanding. Sort of 'chase' this to the edge of the patch as you gradually sand it down. Then start at the top again and do the other side.
Click to expand...
Thanks a lot for the interesting tip for the sanding technique, I'll try to do exactly like you said, I guess I'll have a luck with EPDM patch )))

Hangtight said:
The first couple of times you do a patch you might have to repeat this a few times until you're happy, but with a bit of practise it takes about 5 minutes to do .
Click to expand...
I guess that it might work with EPDM or harder Silicone rubber or higher quality silicone tubing that mine, because I have quite soft one. Generally when I bought Silicone tubing (Either locally in Ukraine or Aliexpress or Ebay ) all suppliers assured me that the hardness of Silicone tubing ~ A60 Shore but in fact when I glued patches into the barrel window It was about 0.5 mm to sand-off and it kooks like piece of cake (at the beginning of my attempts to have perfect R-hop build ,it was about 2,5 month ago).

In fact I could spent from 30 minute to more than hour without any luck to sand patch down to the shape of the barrel. The reason is that material becomes extremely viscous after about 4-5 minutes of sanding it with sand-paper then patch sticks to sand paper and finally rips-off (((.
It happened quite a lot times to me, so I decided to ask a question on different forums and find out which glue people use to glue the r-ho patch in.
3 types of Super Glue and 2 types of Silicone RTV was not an option to me ))) So I thought that maybe people use some specific sort of glue .....

Alternatively I tried to use following technique and it worked for me once
I mean when I could "shave" patch without ripping it off the barrel )

Hangtight said:
I use the stuff that kitchen fitters use. It's thicker, stays where you put it, will fill small gaps and comes with a spray can of activator that sets it off instantly.
Click to expand...
Could you please give me a link for the stuff you are talking about?
It might be the decision of my problem, but I have no clue what it the thing you are talking about.
And thanks a lot again about detailed sanding technique explanation!
 
#219 ·
SniperPenguin said:
Здравствуйте, fellow Ukrainian!
Click to expand...
Actually "Здравствуйте" is in Russian
In Ukrainian it will be "Вiтаю" but in fact it was a nice try )))
SniperPenguin said:
I am rusty in my writing, but I can fully speak it and read it.
Click to expand...
Yeah, sorry for my writing skills, but please do not forget that English is not my native language, so I'll excuse in advance if I write something stupid/funny :yup:
SniperPenguin said:
Anyways, I believe you can order McMaster tubing online.
Click to expand...
McMaster do not ship anything outside of US, which is extremely sad. Some people from Europe complaint about this earlier in this thread (

SniperPenguin said:
Some people do not even glue the r-hop patch down, and just put a bucking over it.
If you would like glue, I am not sure how to help you here. I will leave my r-hop patch "floating."
Click to expand...
As I mentioned in my previous post just put in an r-hop is not an option for sniper rifle with > 550 FPS, it causes зфеср wrapping inside and BB jamming which happened to me several times. So glue is the must here, but I do not know which glue able to "stick" to the silicone rubber without ripping-off at the slightest pressure applied ....
 
#220 ·
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