R-hop Questions

Which R-hop barrel brand should I choose?

Prometheus Barrel

This stainless steel barrel combined with the r-hop is the best barrel you can get for the price point. The Prometheus R-hop barrel is our top recommendation for most players. They are manufactured in Japan with very high tolerances, and the barrels come very straight out of the box. They use superior SUS304 steel compared to other barrels on the market. The polished internal bore and r-hop give enhanced range and accuracy to the user. The internal bore has a diameter of 6.03mm, making it an effective tight bore while still remaining practical. In conclusion, we highly recommend this option for most players that are looking for the best range and accuracy upgrade they can get at a reasonable price.

PDI Barrels

PDI manufactures the highest grade quality steel inner barrels you can get on the market and they are famous for it. They are manufactured in Japan, The machining method for PDI Barrels is cold-hammer forging, which is the same process that real firearm barrels undergo.  This process creates the best consistency for your bore. The machining tolerance for the inner barrel is +0.002mm, which means they offer the highest quality tolerance in the entire airsoft industry for inner barrels. PDI Barrels also have the best lapped inner bore surface quality for steel barrels on the market at ~20 microns. The steel material used is SUS304 Stainless Steel, which is the highest quality steel used for inner barrels on the airsoft market. PDI Barrels are also the straightest barrels on the market thanks to their superior machining. PDI Barrels also undergo strict quality control. In conclusion, PDI sought to make the best possible steel barrel on the airsoft consumer market and succeeded. These barrels are highly recommended and are personally used by our technicians. It is also recommended to add-on a lapping service for this barrel, which will give it an inner surface like EdGI.

ZCI Barrels

ZCI has one of the best prices for performance ratios, being able to give a good performance for an affordable price. ZCI Barrels are constructed out of stainless steel and also feature a quality bore surface quality, very good for the price. ZCI Barrels are manufactured in China, which helps to bring costs and prices of ZCI Barrels down. The machining method used for ZCI barrels is Barrel Extrusion, a common method used for most inner barrels for airsoft. The machining tolerance is around +0.02mm – 0.05mm. In conclusion, ZCI stainless steel barrels is the best stainless steel barrel at its price point of around $20-$30 and absolutely recommended by airsoft technicians around the world.

EDGI Barrels
EDGI Custom Works manufactures the highest end barrels on the airsoft market. EdGI makes the world’s greatest inner barrels, hands down. The internal surface of EdGI Barrels are hand lapped and polished down to ~7 microns, giving it a mirror finish.

Our Guarantee Warranty

We have a guarantee that you will leave feeling satisfied with a working product. In many cases with other installers lacking real credentials, you just don’t know what you are getting in regards to the quality of the install and product. You could be risking your money to getting a shoddy product.

Our installs have a ~95% success rate on the first package. However, if you did end up getting a defective product from a mishap, we will absolutely resolve them for you. We will pay for return shipping and ship a brand new product to you at no extra cost!

We also have a lifetime warranty on all of our rhop products. We will fix it for FREE.

(under reasonable circumstances, contact us for more information on warranty policy)

This is our guarantee.

What weight bbs should I use?

0.30g and up recommended for optimal performance of the R-hop. Use high-quality brand bbs.

Using high-quality heavy bbs is ideal for performance; 0.25g is good, 0.30g and up would be even better. The heavier the bb, the better your accuracy, consistency, and range will be.


Shipping & Delivery

How long does shipping take?

Regular orders will ship within 1 business day.

All R-hop orders will be shipped within 2 week lead time or less.

This is because we take our time and expertise to professionally install each r-hop and rigorously test them before shipment.

It's been more than two week, what is the status of my r-hop order?

In very rare cases, your r-hop order may have been delayed, most likely due to temporary stock issue. We may have ran out of stock on something required to create your order.

No worries, please be patient with us. Your order will ship indefinitely as soon as it’s completed.

If you would like an elaboration and re-estimated time on your order, you can contact us at contacthopsystems@gmail.com

Estimated shipping delivery time to my country?

United States
USPS First Class Mail Estimated Delivery Time: 3-5 days
USPS Priority Mail Estimated Delivery Time: 2-3 days

USPS First Class Mail Estimated Delivery Time: 5-10 days
USPS Priority Mail Estimated Delivery Time: 5-7 days

USPS First Class Mail Estimated Delivery Time: 7-21 days
USPS Priority Mail Estimated Delivery Time: 6-10 days

Do you ship international?

YES! We ship international to everywhere! Every country has received our packages, so you can shop with confidence.

If you need any special requests for shipping to your country or address, please contact us at contacthopsystems@gmail.com

Will I receive a tracking number?

YES! All orders include tracking. The tracking number will be sent to the email address you provided us.

If the tracking has not updated yet, your order is still being prepared.

Once the package has shipped, your tracking number will update.

If you did not receive a tracking number via email, please contact us at contacthopsystems@gmail.com

I need to update my shipping address.

We understand everyone makes mistakes! If you have a typo or the wrong address, please email contacthopsystems@gmail.com ASAP.

Please make sure your address is correct and valid for shipment.

Unfortunately, if your order has already shipped, tehre will be no way for us to update the shipping information.

Compatibility and Installation

Which hop up chamber and r-hop barrel is compatible with my airsoft gun?

Lonex M4 Hop Up Chamber

This is a one piece hop up chamber that is compatible with the majority of the M4/M16 platforms on the market. Sometimes the c-clip that comes with the lonex chamber is too thick to fit in your receiver, if this is the case, please swap the c-clip with your old one on the lonex chamber. This chamber is not compatible with Krytac, KWA, and ICS.

Prowin CNC M4 Hop Up Chamber

This is a rotary style one piece hop up chamber that is compatible with the majority of the M4/M16 platforms on the market. This chamber is not compatible with KWA, and ICS.

Image result for prowin hop up chamber

Krytac M4 Hop Up Chamber

This is a rotary style one piece hop up chamber that is made for the Krytac. Please choose this hop up chamber for KRYTAC platforms as it is the most compatible with them. Please choose the Krytac bucking with this hop up chamber. This hop up chamber is also compatible with the majority of the M4/M16 platforms on the market. This chamber is not compatible with KWA, and ICS.

Image result for krytac hop up chamber

KWA M4 Hop Up Chamber 

This is a two piece style hop up chamber (KM4 Style). This hop up chamber is proprietary and only compatible with KWA M4/M16 platforms. Please choose the KWA bucking with this hop up chamber. Please only use this hop up chamber if you have a KWA. 

Image result for kwa km4 hop up chamber

ICS M4 Hop Up Chamber

This is a rotary style one piece hop up chamber. This hop up chamber is proprietary and only compatible with ICS M4/M16 platforms. Please choose the ICS bucking with this hop up chamber. Please only use this hop up chamber if you have a ICS.

Image result for ics hop up chamber

Lonex AK Hop Up Chamber

This hop up chamber is compatible with the majority of all standard AK platforms.

Image result for lonex ak hop up chamber

How to check your hop up chamber

One piece hop up chambers are only compatible with airsoft guns that use one piece chambers. If your airsoft gun uses a two piece chamber, it will not be compatible. Please check that your airsoft gun uses the correct hop up chamber style by revealing the dust cover or taking your upper receiver off.

AEG R-hop Barrels

Our AEG R-hop barrels are compatible with all hop up chambers that accept regular AEG inner barrels.

VSR R-hop Barrels

Our VSR-10 R-hop barrels are compatible with all VSR-10 platforms and hop up chambers that accept VSR-10 inner barrels.

If you need more help on choosing the right hop up chamber for your airsoft gun model, please contact us at contacthopsystems@gmail.com

How do I install my R-hop barrel?

To install your R-hop barrel, you will need a flat-hopped bucking. If you don’t have one, you can order one with your R-hop barrel, or separately here.

Lonex Flat-Hopped AEG Bucking Required for R-hop

Action Army VSR-10 Flat-Hop Bucking (Flat-Hopped by Hop Systems)

Here is a Youtube video we recommend for simple barrel and bucking installation.



The Lonex M4 hop up chamber doesn't fit.

Lonex M4 hop up chambers come with a thicker c-clip that may or may not fit your airsoft gun. In this case, please swap the lonex c-clip with your old standard M4 c-clip from your previous hop up chamber.

When installing the c-clip, make sure the hopup and barrel are centered with the c-clip and pushed together back tightly until the c-clip locks into place to ensure there is no air leak.

If the hop up chamber still does not fit after this, then the Lonex hop up chamber is not compatible with your gun. No worries, you can contact us at contacthopsystems@gmail.com for a hop up chamber swap to a compatible one customized for you.

Not getting any hop

This most likely means there isn’t enough pressure being applied to the R-hop patch. Any installation errors may be causing these issues.

First check if your nub fell out during installation, you may need to re-install it.

If you are using an m-nub, or a flat nub adhered to the hop up arm. Your flat nub may be too short, you will need to raise the height of your flat nub.

Your flat nub may be getting caught on its way down, make sure your flat nub is not chaffing the sides of your chamber. You may need to re-size your flat nub.

We recommend purchasing a flat hop up chamber with your R-hop barrel from us to ensure professional modification so these problems cannot happen.


Which methods of payment do you accept?

We accept all major credit cards, and PayPal.

Hop Systems is committed to protecting your personal information and providing a secure online experience. We use industry standard encryption and password protection technologies with SSL (Secure Socket Layer). Sensitive information including any type of payment information is not stored on our servers.

All credit card numbers are processed through Stripe payment gateway. The payment gateway is certified to PCI Service provider Level 1. This is the most stringent level of certification available in the payment industry.

The item I want is out of stock.

Hop Systems generally aims to restock items within 1-2 weeks. Some products may take longer to restock due to long manufacturing times.

Please contact us at contacthopsystems@gmail.com If you would like a more accurate restock time for a specific item you want, we will expedite it for you and let you pre-order it.

I want to change or cancel my order.

No problem, please contact us at contacthopsystems@gmail.com ASAP before your order ships. We will gladly help you with anything.

If you want to add anything to your existing order. You can make another order and we will refund your shipping cost on the second order and combine your order.

Do you accept custom service orders?

We are not accepting any customer service orders at the moment. Although, we are bringing back this service in the future.

You cannot send us anything that isn’t from our store for custom servicing at the moment.

We will still service our r-hop barrels, flat hop up chambers, and buckings from our store for warranty, and services.

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