Hanuman AR-15 Based Bullpup Receiver
This is the Hanuman, an AR-15 Based Bullpup. This file set is meant as a proof of concept. It is a prototype. There is no safety. There is no guarantee it will not harm or kill its operator. There is no guarantee it is legal in your location in all configurations. OAL Guidelines are stated with Federal Law in mine for the USA. Check for Local Laws before printing ANY firearm.
This design REQUIRES a bufferless AR-15 upper. Suitable platforms are the ARAK-21, Rock River Arms PDS Carbine, and CMMG Style .22LR Conversions for regular Upper Receivers. Use of 5.56/.223 with a standard BCG WILL result in catastrophic failure of the firearm, which could result in serious or fatal injury. I say again, DO NOT USE A STANDARD BCG IN THIS FIREARM.
Included in this design is a simple (optional but recommended) charge handle designed by patrickiv and RollaTroll. It is a single printed piece that slides along the Picatinny rail on top of the upper receiver. The concept is to give a standard AR a method of charging that is closer to the off hand while reloading or clearing a malfunction. When it is pulled back, one of the feet at the back actuates the catch on the rifle's original charging handle. This charge handle design was initial created for the Hanuman Bullpup AR Lower Receiver but can be used other rails (resp.). The charge handle will work without issue on any upper with a picatinny rail, and should work with any charging handle. Optics interference will require forward mounting of a red dot sight or long eye relief scope.
OAL, the NFA, and YOU
If you are using an upper receiver with a 16" barrel, you must use the 3 Inch Buttpad Extension to meet the minimum legal OAL of 26". With a 16" barrel, the OAL of the platform is 26.25". If you are using an 18" barrel, you must use at least the 1" Buttpad Extension, bringing the OAL to 26.25". If you are using a 20" barrel, you may use the 1/4" buttpad extension without fear of breaking laws concerning SBR minimum overall lengths.
Printing Instructions
USE ABS PLASTIC.
All parts are oriented in optimum direction as far as I can determine, but it is left up to the experience and intuition of the print operator to decide. Support material is recommended to be on. Use settings that minimize warp and shrink, as well as maximizing accuracy and strength. Dimensions are CRITICAL.
Support material is necessary for Receiver_Grip_2, Receiver_FCG_Right, Receiver_FCG_Left, Trigger_Carrier, and Mag_Release_Arm.
Total weight of 12x receiver marked parts is 1.45 pounds, not including support material or auxilary parts.
Printed Part List
Print one of each file EXCEPT THE FOLLOWING.
ASSEMBLY
END NOTES
These instructions assume you are not a moron. If something feels wrong, stop. If you have doubts, stop. If you get a funny tickle, stop. You can contact me via www.fosscad.org and then click on the Chat link at the top. If I am not there, another FOSSCAD member will be able to assist you or take a message and I will get back to you. This firearm is INCREDIBLY experimental, and is meant as an ergonomics, feasibility, and design test. You are taking a risk just by building it. If this bothers you in the slightest, do not build one.
If you've made it this far, I applaud you. You're one of the few that will actually succeed in creating this firearm. Feel free to modify, remix, create and destroy this model to your heart's content. We at FOSSCAD love pictures and testing videos, and even love having new names in the chat to talk to.
As always my friends,
You are free. Act like it!
File | Extension |
---|---|
AR-15Hanuman_Bullpup_v1.1-WarFairy.zip | zip |
Version: 1.0.0 latest
initial upload
Hanuman AR-15 Based Bullpup Receiver
This is the Hanuman, an AR-15 Based Bullpup. This file set is meant as a proof of concept. It is a prototype. There is no safety. There is no guarantee it will not harm or kill its operator. There is no guarantee it is legal in your location in all configurations. OAL Guidelines are stated with Federal Law in mine for the USA. Check for Local Laws before printing ANY firearm.
This design REQUIRES a bufferless AR-15 upper. Suitable platforms are the ARAK-21, Rock River Arms PDS Carbine, and CMMG Style .22LR Conversions for regular Upper Receivers. Use of 5.56/.223 with a standard BCG WILL result in catastrophic failure of the firearm, which could result in serious or fatal injury. I say again, DO NOT USE A STANDARD BCG IN THIS FIREARM.
Included in this design is a simple (optional but recommended) charge handle designed by patrickiv and RollaTroll. It is a single printed piece that slides along the Picatinny rail on top of the upper receiver. The concept is to give a standard AR a method of charging that is closer to the off hand while reloading or clearing a malfunction. When it is pulled back, one of the feet at the back actuates the catch on the rifle's original charging handle. This charge handle design was initial created for the Hanuman Bullpup AR Lower Receiver but can be used other rails (resp.). The charge handle will work without issue on any upper with a picatinny rail, and should work with any charging handle. Optics interference will require forward mounting of a red dot sight or long eye relief scope.
OAL, the NFA, and YOU
If you are using an upper receiver with a 16" barrel, you must use the 3 Inch Buttpad Extension to meet the minimum legal OAL of 26". With a 16" barrel, the OAL of the platform is 26.25". If you are using an 18" barrel, you must use at least the 1" Buttpad Extension, bringing the OAL to 26.25". If you are using a 20" barrel, you may use the 1/4" buttpad extension without fear of breaking laws concerning SBR minimum overall lengths.
Printing Instructions
USE ABS PLASTIC.
All parts are oriented in optimum direction as far as I can determine, but it is left up to the experience and intuition of the print operator to decide. Support material is recommended to be on. Use settings that minimize warp and shrink, as well as maximizing accuracy and strength. Dimensions are CRITICAL.
Support material is necessary for Receiver_Grip_2, Receiver_FCG_Right, Receiver_FCG_Left, Trigger_Carrier, and Mag_Release_Arm.
Total weight of 12x receiver marked parts is 1.45 pounds, not including support material or auxilary parts.
Printed Part List
Print one of each file EXCEPT THE FOLLOWING.
ASSEMBLY
END NOTES
These instructions assume you are not a moron. If something feels wrong, stop. If you have doubts, stop. If you get a funny tickle, stop. You can contact me via www.fosscad.org and then click on the Chat link at the top. If I am not there, another FOSSCAD member will be able to assist you or take a message and I will get back to you. This firearm is INCREDIBLY experimental, and is meant as an ergonomics, feasibility, and design test. You are taking a risk just by building it. If this bothers you in the slightest, do not build one.
If you've made it this far, I applaud you. You're one of the few that will actually succeed in creating this firearm. Feel free to modify, remix, create and destroy this model to your heart's content. We at FOSSCAD love pictures and testing videos, and even love having new names in the chat to talk to.
As always my friends,
You are free. Act like it!
3.8K
227
Oct 5, 2023
Primarily Printable, Hybrid, Printable Lower / Frame
3D Printer
United States
English
No license
File | Extension |
---|---|
AR-15Hanuman_Bullpup_v1.1-WarFairy.zip | zip |
Version: 1.0.0 latest
initial upload
The files shown on this site are only available to U.S. Persons, as defined at 22 C.F.R. 120.15. The files are also not available to persons outside the United States or to residents of and persons in the State of New Jersey, with the exception of Federal Firearms Licensees.