Z-RAM ZDR50 Case for the Umarex HDR50/TR50: Hidden Z-Extension, Colors and Assembly

This article preserves the original ZDR50 case presentation, its assembly, performance and safety claims, stated screw quantities and future plans in their historical context.

The ZDR50 case for the Umarex HDR50/TR50, now also in black

Welcome to the Z-RAM YouTube channel. Daniel introduces the ZDR50 case in more detail and shows how to install all the parts—in other words, how to change the case.

The first version is shown here. The new version is a little smoother; a few layers are still visible here too, but it is much smoother than before. The new development is that it is now also available in black. The first version was only available in silver, and now there is a black version too. The silver example has a reddish-brown grip, while the black one has a somewhat darker brown grip.

Daniel would be interested to hear how viewers like the colors and whether they would like other grip colors. Suggestions would be very interesting—perhaps simply making black grips. He would like to know what viewers think.

Everything is installed here, with all the HDR50's internal parts inside. Today's demonstration transfers those internal parts into the black case, shows the finished appearance and shows how to position the pieces. Time to begin.

Opening the case and retaining the HDR50/TR50 screws

All the parts have already been installed in the case. Daniel will now open it and take the parts out again. In principle, this is almost the same as working with the original HDR50. Undoing all the screws shown here allows the case to open. Daniel now undoes the screws and removes the barrel cover.

The tuning barrel cover has now been removed. Slightly loosening the screws here allows it to be pulled off like this; they do not have to be undone completely. The extension has also been removed from the tuning barrel. Here are the case screws. Treating this as the standard HDR50, all the screws are undone and the housing can then be opened. It is basically the same as the HDR50.

All the screws will be needed. When the parts are ordered from Z-RAM, two additional housing screws are supplied, plus ten additional screws for the grips—actually eight, with two spares. In any case, the screws from the existing case are definitely needed. They are the first items needed from the standard HDR50 housing.

The concealed Z-Extension and the case's solid construction

The case opens like this, just like the original HDR50. The HDR50's interior is now visible. This is where the barrel is installed, and also where the Z-Extension is installed. As shown, the extension is attached and disappears completely inside this case. That is the main reason Z-RAM developed the housing: to protect the Z-Extension from falls, conceal it and create this neat appearance.

As shown here, the case is also very high quality, very stable and rigid. This area is solid throughout. The original case is not filled here; it is just thin plastic. This case is filled, making it a little more stable than a standard case.

All the small pieces shown here are taken out; they will also be needed. This whole assembly is taken out too. The barrel and the part shown here are needed. Those are the parts required from the HDR50: the barrel, this whole assembly, this part and the screws. The work can continue with those. The black case is now shown here.

The Z-Extension and the transferred internal parts

For anyone not yet familiar with it, the Z-RAM Z-Extension is at the back here. It increases chamber volume and therefore provides more power. It is screwed on here where the brass cap normally sits; the brass cap is then screwed onto the Z-Extension. Both are secured together with threadlocker so the assembly will hold. This is high-quality stainless steel, so the threads will not simply snap or anything of that kind on their own.

It can be used here with very simple assembly. This housing does not have to be opened: the Z-Extension can be screwed directly on here and then inserted into the housing. The tuning barrel then goes back in here. The spring must be correctly positioned here, followed by this part with its rounded side facing up so that it fits through here. The other part is placed on top like this. It is important that the barrel can move and is under pressure. That is it. Daniel now puts all the screws in, fits the grips and screws them together.

The housing is now screwed together, with all the screws fitted. The barrel moves, the other part moves too, and this works as well. There are four screws here, so this part is screwed together very firmly and is very stable. When the grips are added, four more screws go in here. That makes this whole area very stable.

Even if something were to burst here, this housing is safer than the standard housing because it is secured with so much material and so many screws. The Z-Extension is also a little safer here. The housing also ensures that users are on the safe side.

The grip screws and the standard barrel configuration

Daniel now screws the grips together. The set supplies ten screws in total: four screws for each grip, one grip on this side and one on the other. The housing has one more screw than the standard housing; that is supplied as an extra, and one screw is simply a spare. So there are ten screws: eight for the grips, one for the case and one spare. Daniel now fits the grips.

The grip is now installed too. This would be the standard version without the barrel extension. The extension is still here and will be mounted next, but the setup already serves its purpose as it stands: it looks cool, hides the Z-Extension at the back and makes it a little more secure.

Power and shot-count statements for this HDR50/TR50 setup

The Z-Extension provides more power here. The PowerPin is also installed, adding a few more joules. The chamber block and the valve in the grip have both been completely removed. This means the setup now has the maximum possible performance. It will probably deliver a few fewer shots, but if the shot count is insufficient, the Modify Pin can be added here. That reduces performance a little but makes more shots available again.

Daniel still recommends installing the tuning barrel with its extension when all these parts are installed, because the overall performance is then much more effective. The longer barrel gives the additional energy and air space and time to develop while the valve is open. Daniel now mounts the extension here: the standard extension supplied with the tuning barrel.

There is also the sniper extension shown here, which screws in here and makes the whole setup a little longer. It becomes more interesting with the ASA-to-Chamber Adapter connected here, which is still possible with this case. The ASA-to-Chamber Adapter simply screws onto the Z-Extension, allowing a bottle to be screwed on here. With the sniper extension and perhaps another grip here, the result is a really cool long setup.

Daniel made a similar setup in another video, linked above, but without this housing. In principle, that entire setup can also be recreated here. There are corresponding offers in the Z-RAM shop: one with the ZDR50 housing and one without. The demonstration now continues.

The barrel cover and included punch button

The barrel extension has been screwed on, and the barrel cover is now fitted here. It can also be bought separately, so it does not have to be bought together with the other parts. It is available separately and would need to be ordered as well. Daniel would first insert the screws here: they are screwed in lightly, the cover is slid on and the screws are tightened again.

The cover is now screwed down. There is still a little play here, which the barrel needs. The result is the black ZDR50 version with the barrel extension and its accompanying cover. There is also the grip's punch button, which belongs to the set and is included in it. It conceals this area quite well, and the gap is also very small—quite enough to pierce the capsule.

The drum and the pointed 6 g Z50 V2 projectiles

Next is the drum. This part must be removed from the standard HDR50 drum and put in here. If it has a little too much play, it can be glued; if it is a little harder to push in, it can be left as it is. It comes out like this, or by pressing on it from the side, from behind, until it comes out.

The Z50 V2 projectiles can now also be used here: 6 g, with grooves that spin the projectile during the shot and in flight, and very sharp. Very pointed and very sharp. They are loaded from behind and fit perfectly in the drum. That basically completes the setup.

The brown grip's wood-plastic material and planned shooting videos

Daniel thinks the result looks really cool and especially likes the brown grip, which looks a little like wood. The 3D printer filament is a wood-plastic mixture, so it actually contains wood. It also feels very pleasant and comfortable in the hand; it feels very good. That is basically what the video set out to show today.

There will also be shooting soon. Unfortunately, Daniel's chronograph is defective and is currently being exchanged. The exchange is taking time, which is why there are no chronograph videos at the moment. A video with the FSC and ASA-to-Chamber Adapter was also planned—that is, the Tiberius FSC/PepperBall TCP with the ASA-to-Chamber Adapter—but that requires the chronograph. As soon as it arrives, Daniel will make another video with it.

Feedback on future case materials and grip colors

Today's purpose was simply to show the black ZDR50 case again. Viewers are invited to write in the comments what Daniel could change or improve in future versions of the ZDR50 case. In principle, different materials will be tried, and he would be interested to know which grip color viewers prefer. If the available colors are too colorful, he is already considering offering a black grip as another choice. That would make it look almost like the original HDR50 again, except that the Z-Extension would still be hidden. That is basically the main reason the case was made.

Daniel is curious about viewers' suggestions and looks forward to their suggestions. Please leave a thumbs-up, subscribe to the channel for more content and have a nice day. Daniel from Z-RAM.

Explore the current offers: Umarex HDR50/TR50 ZDR50 CO₂ Packages: 35 J with 12g or 23 J with EX25?.

Current products — separate from the historical presentation

Z-RAM ZDR50 Black Body Kit for Umarex T4E HDR50 TR50 Innards (Hide Z-Extension!)

The original black ZDR50 body kit is a PLA housing designed to hide the Z-Extension. The body, drum, grip, screws and piercing button are listed; the extension and donor-marker internals are not included. This is not the ZDR50v2 body.

View the current offer

Z-RAM Z-Extension Tuning chamber-extension for all Umarex T4E Typs & FSC/TCP

The current Z-Extension offer is a chamber extension with one O-ring. This is the individual accessory; no complete marker is included. Existing ownership of the extension should be considered before buying another.

View the current offer

Important Legal Notice

Laws and regulations governing the purchase, possession, installation, modification, and use of the products described on this page vary by country, state, and local jurisdiction and may change. Before purchasing, installing, modifying, or using any product, you are responsible for confirming that it is permitted in your location and for your intended purpose. Product availability or delivery does not mean that purchase, possession, installation, modification, or use is lawful in your jurisdiction. Z-RAM does not provide legal advice, and the information on this page must not be treated as legal advice. If you are unsure, contact the competent local authority or a qualified legal professional.