Overview
The STG556(S) is an advanced 3D-printed firearm project, designed for users with significant prior experienceโideally, having completed 3-4 printed rifle-caliber builds. At its core, it is a carbine-length AR-15 build, disguised as a replica of the iconic Sturmgewehr 44. This fusion of historical design and modern engineering results in a unique and highly customizable firearm.
Careful attention is required during the build process, especially for fitting parts such as the fire control group (FCG) and handguard, which may need hand-fitting due to tight tolerances. Proper material choice, such as PLA Pro, is critical for achieving the best results, as durability can vary significantly.
In the Wild
Images
Features of the Sturmgewehr-556 (STG-44)
This build combines the aesthetics of the historical STG-44 with the functionality of an AR-15 platform. The STG556(S) is compatible with AR-15 components such as barrels, bolt carrier groups, and magazines, ensuring reliability and flexibility.
It features a 40-round prototype magazine designed for 5.56 rounds, which is slightly shorter than an original STG magazine. It can accommodate various AR-15 magazines, including STANAG-pattern mags, ensuring a wide range of usability.
The STG556(S) is suitable for reenacting, as it supports cycling blanks when equipped with a “Hollywood” flash hider blank adapter. However, the buildโs thin-walled parts, like the fire control group, are modeled after the original STG-44โs design and require precise printing and material selection for durability.
Notably, this firearmโs appearance may raise concerns in certain contexts, so exercise discretion in its use or display.
Hardware and Tools Required
Hardware
- AR-15 components including:
- 16″ 5.56×45 barrel with carbine-length gas system
- Bolt carrier group
- Carbine buffer weight and spring
- Safety detent and spring
- Low-profile gas block (.750″ diameter)
- Magazine catch bar, trigger group, and springs
- Metric bolts:
- M5, M4, and M3 in various lengths
- Inch-pattern bolts for specific attachments
Additional Parts
- Takedown pins (compatible with H&K-style detent pins for the G3)
- Optional reproduction G43 front sight hood
- Custom muzzle device or historically accurate fluted thread protector
3D Printed Parts for the Sturmgewehr-556 (STG-44)
- Receiver (requires hand-fitting for FCG and handguard)
- Fire control group halves (high precision required; print at .12 layer height)
- Prototype magazine housing and follower
- Optional gas plug components for enhanced functionality
Tools Required
- Soldering iron
- Drill/tap set (M5x0.8)
- 4mm mill bit
- Red thread locker
- High-temperature epoxy
- Super glue
Sturmgewehr-556 (STG-44) Instructions
Conclusion
The STG556(S) combines historical charm with modern modularity, making it a standout project for experienced builders. With proper materials, precision printing, and some hand-fitting, this build offers a striking replica and reliable firearm performance. Always exercise caution and responsibility when building or displaying this project!
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