Please read the F.A.Q. down below if you have any questions! Most of the things I've been asked repeatedly about this kit have already been answered!
This is a Carbine Conversion Kit for AIRSOFT TOYS and cannot be modified, manipulated, or converted for use with a firearm. It cannot be modified, manipulated, or converted to discharge firearm ammunition.
This kit was designed for the dimensions of a Tokyo Marui Hi-CAPA 5.1. It will not fit other sizes of Hi-CAPA (4.3, 7.1, etc). It may also have fitment issues with non-TM branded or aftermarket upgraded models. Please read the Print Settings section for details.
The JTW HCC-2A is the evolution of the Hi-CAPA Carbine Version 1 (https://www.thingiverse.com/thing:3555822). The idea of this project is to create an open-source Hi-Capa 5.1-compatible carbine kit for airsoft gas pistols, as there are no open source projects like this elsewhere currently. When I say open source, I MEAN open source – want to print your own? The files are and will forever be COMPLETELY FREE. Want to print some to sell? You’re absolutely allowed to – with personalization/customization/other modifications as well – if you link back to this Thingiverse post in your ad listing!
The HCC-2A has been tested for functionality but needs testing out in the field. If you use one, let me know what you think! What could be improved? Anything added? If you have any suggestions for new features, or ways to improve the existing features, let me know! If your idea is added to the kit in some way, I’ll credit your contribution!
-Forward magazine holder and grip (active retention)
-Original thumbhole stock design
PLEASE print Rail_Slot_Test.stl and Rail_Lock.stl FIRST and ensure they fit properly on your Hi-CAPA!
There are many parts to this project, so please watch the assembly guide. This kit requires having a Tokyo Marui or derivative Hi-Capa 5.1 with the accessory rail. It will NOT work without the accessory rail!
The entire kit is able to be printed without concern using PLA. If you really want to use a different, stronger material for specific parts, consider printing the Optic Rail, Grip Rail, Action Camera Mount, Charging Handle, and Stock Tang out of PETG or Nylon, as these parts support most of the strain and tension on the kit.
Assembly and Overview:
Hardware you will need:
- M4 Nut x13
- M5 Nut x1
- 18mm M4 Screw x3
- 16mm M4 Screw x1
- 10mm M4 Screw x3
- 8mm M4 Screw x6
- AEG M4 Buffer Tube w/Screw and Collar
- Screwdriver (Hex, Phillips, or Flat depending on what screws you’re using)
- Deburring tool
- Sandpaper and Files
Optional (but recommended):
- PLA-compatible adhesive
- Thread Locker Compound
- 125-150% Recoil Spring
I recommend using a thread locking compound on all screws. I also recommend that you glue the rails in place as well as screwing them in, unless you really want them to be highly modular/replaceable pieces. A 125-150% recoil spring may be required for older TM models.
Some parts will require sanding/fitting because the exact accuracy of some parts is heavily reliant upon print quality and consistency. One printer might print slightly out of spec, so things tend to fit “tight” and need sanding, while someone else’s printer might be highly accurate, and the kit might be ready to go right off of the build plate. Noteworthy parts that may require sanding are the rail cutouts in the receiver, the bottoms of the rails themselves, the charging handle, and the rail lock.
I suggest printing the rear receiver in top-down orientation. It can be printed vertically with success, but there is a potential for layer separation if you do so.
Q: What kind of Hi-CAPA will this fit?
A: This kit will ONLY fit standard 5.1 Hi-CAPA bodies – 7.1 Hi-CAPAs are too long to mount properly, 4.3 Hi-CAPAs will not interact with the charging handle properly, and 1911/MEU style airsoft pistols are entirely not compatible (the dust cover sits too low on them with the rail installed). It is 100% compatible with Tokyo Marui 5.1 Hi-CAPAs, and therefore should also fit other standard-style 5.1 Hi-CAPAs.
Q: Can you make this smaller, so it prints on my printer?
A: Check the Remixes! Mdigibou has split the rear receiver into two pieces, allowing the entire kit to be printed on a printer with a 220mm^3 build area!
Q: Can I print and sell this kit, iterate on it, and make accessories for it?
A: Yes! This kit is completely open-source. If you want to republish the kit files or sell printed parts, please credit me as the creator and link back to this upload!
Q: If I sell prints of this kit, can I remove the markings you’ve put on it?
A: I would really prefer you don’t as I worked VERY hard on this project.
Q: Can I buy a carbine kit from you?
A: Yes! I am offering these on a made-to-order basis for $8. each before shipping. I am only selling the kits within the continental United States. Turnaround time is 2-3 weeks. Contact firstname.lastname@example.org to discuss details and pricing. Additionally, there are various print services you can have print a file for you (though this may cost substantially more).
Q: Can you please customize this one specific part of the files for me?
A: Sorry, but I’m trying to move on from this project (I’ve been working on it for a very long time!). If you’d like to commission me to make or modify a custom part for you, contact me at email@example.com to discuss details and pricing.
Q: Can I have the .OBJ's so I can edit this in Autodesk family software?
A: Here you go: https://drive.google.com/drive/folders/1xr46nHo7fCHXDQukNqw2PCJGJ-KtgVul?usp=sharing
Q: What kind of threading is on the Muzzle Plate?
The threading on the muzzle has a diameter of 20.8mm, with a 2mm pitch, with a 36 degree thread angle. I wanted the dimensions to be 20mm, 2mm, and 25 degrees respectively, but Blender doesn't offer that much control in making threading. Also, be aware that these dimensions won't necessarily reflect accurately in the final printed model with FDM printing.
- JTWCraig (me!) - Creator/Curator
- MemorableC - General design considerations
- Nain - Receiver design considerations
- Adjusted Rail_Optic.stl and Grip_Rail.stl to fit accessories better.
- Adjusted Action_Camera_Mount.stl to fit action camera hardware better.
- Added Cam_Mount_Blocker.stl, which can be printed instead of the camera mount for people who don't want to use action cameras.
- Removed the extra piece from Rail_Slot_Test.stl.
- Added printable options for Buffer Tube, Buffer Tube Nut, and LE-Style Stock in the Remixes.
- Changed the dimensions of the threading on Muzzle_Block to accept threaded muzzle devices, soon to be released.
- Repaired model for Cam_Mount_Blocker.
- Modified receiver_rear to align stock mount holes properly.
- Modified stock_tang to work better made out of PLA.
- Modified receiver_rear to fix a few normals that had flipped. Also recessed the screw holes so you now can use much shorter, easier to obtain M4 screws to install the Stock Mount.