Tag: installation
HPA Conversion Compatibility Guide
What’s in a Kit?
AEG Conversion Kits include an HPA engine and airline as well as required electronics components for standard installations. For example, our INFERNO kits are available in the four options.
V2 Kit
- INFERNO with M4 Nozzle
- V2 Trigger Board
- Premium FCU
- 14″ Wire Harness
V2 Spartan Kit
- INFERNO with M4 Nozzle
- Spartan Electronics
- 14″ Wire Harness
V3 Kit
- INFERNO with AK Nozzle
- V3 Trigger Board
- Premium FCU
- 12″ Wire Harness
M249 Kit
- INFERNO with M4 Nozzle
- Premium FCU
- M249 Wire Harness
Choosing the right kit
See the list below to ensure you obtain the correct kit for your replica. See also that some replicas require additional components not part of our standard kits. For example, for the A&K Masada, you’ll need to swap your INFERNO’s nozzle for an A&K Masada nozzle, as well as swap out your kit’s 14″ V2 Wire Harness for the shorter V3 12″ Wire Harness.
MTW Compatibility Guide
The MTW is designed to be a modular platform with highly interchangeable parts within the MTW-Spec family, with real steel firearms, and with AEGs when possible. The chart below can help you answer compatibility questions among different components and MTW series.
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Feature | MTW-M4 (Billet, Forged) | MTW-9 | MTW-308 | MTW-Shotgun | Article Series |
---|---|---|---|---|---|
Barrel (Inner) | AEG | AEG | AEG | AEG | AEG |
Barrel (Outer) | MTW | MTW | MTW | MTW Gen-12 | MTW |
Body Pins | Real Steel M4 | Real Steel M4 | Real Steel 308 | Real Steel 308 | Real Steel M4 |
Bolt Catch | MTW | MTW | MTW | MTW | MTW |
Bucking | AEG | AEG | AEG | MTW Gen-12 | AEG |
Buffer Tube | Real Steel | Real Steel | Real Steel | Real Steel | Real Steel |
Charging Handle | Real Steel with modification | Real Steel with modification | Real Steel with modification | MTW Gen-12 | N/A |
Contact Yoke | MTW | MTW | MTW | MTW | MTW |
Electronics | MTW | MTW | MTW | MTW | MTW |
Engines | INFERNO/REAPER | INFERNO/REAPER | INFERNO | HAVOC | INFERNO/REAPER |
Feed Tube1 | MTW M4 | MTW-9 | MTW-308 | MTW M4 | MTW M4 |
Flash Hider | 14mm CCW | 14mm CCW | 14mm CCW | MTW Gen-12 | 14mm CCW |
Grips2 | Real Steel | Real Steel | Real Steel | Real Steel | Real Steel |
Hop up | MTW | MTW | MTW | MTW Gen-12 | MTW |
Magazines | MTW/AEG (M4) | ASG EVO | MTW/AEG (SR25/308) | MTW/AEG (SR25/308) | MTW/AEG (M4) |
Rails3 | AEG | AEG | AEG | MTW Gen-12 | AEG |
Receiver (Lower) | MTW M4 | MTW-9 | MTW-308 | MTW-308 | MTW M4 |
Receiver (Upper) | MTW-M4 | MTW-M4 | MTW-308 | MTW Gen-12 | MTW-M4 |
Selector Switch | MTW | MTW | MTW | MTW | MTW |
Springs, Pins and Detents | Real Steel M4 | Real Steel M4 | Real Steel M4 | Real Steel M4 | Real Steel M4 |
Triggers | MTW | MTW | MTW | MTW | MTW |
WRAITH Stocks | MTW | MTW | MTW | MTW | MTW |
- Three generations of feed tube exist. For more details, see this article. ↩︎
- If storing battery in or running air line through grip, modification is needed. See video. ↩︎
- MTW barrel nut only compatible with MTW rails. Most AEG rails and Real Steel barrel nuts are compatible. ↩︎
FRAC Installation / Uninstallation
Video Instructions
Text Instructions
Loosen castle nut with armorer’s wrench. Unscrew castle nut all the way back and slide buffer tube plate back. Don’t lose selector spring and detent if not retained in lower. Unscrew buffer tube.

Install FRAC orientation ring against castle nut.

Install FRAC body with button on the left side of the gun. (Shown upside down. Don’t push the button on the FRAC!)

Thread buffer tube into lower. Align buffer tube to gun and push FRAC up to the back of the lower. Snug down castle nut by hand. Do not thread buffer tube in past the front edge of the buffer tube extension or upper will not install.

Tighten Castle nut with armorer’s wrench.

Remove air line with ¼” wrench.

Install FRAC air line with ¼” wrench.
M4/MTW-9: Use 3.5″ airline.
MTW-308/Shotgun: use 4.5″ airline.

Install engine.
M4/MTW-9: Upside down (airline on top of engine).
MTW-308: Install regularly.

Feed airline through FRAC while holding button, then secure body pins.

Uninstallation
Got a FRAC but want to switch back to a traditional grip line? It’s easy to uninstall. But first you’ll need a standard gripline and your choice of sling plate.
Loosen the castle nut with an armorer’s wrench, and then unscrew the buffer tube from the MTW to remove it. If your FRAC was preinstalled on your MTW when you purchased it, your buffer tube may had a small amount of blue Loctite applied to the threads, requiring a little additional force to remove.

Remove the FRAC and FRAC orientation ring and replaced with your sling plate. Reinstall your buffer tube. Do not thread buffer tube in past the front edge of the buffer tube extension or upper will not install. Tighten the barrel nut.

Remove the engine from your MTW and remove the FRAC air line with ¼” wrench. Replace it with your standard grip line and reinstall your engine.

WRAITH MTW-308 Installation
Please refer to the normal installation instructions for your WRAITH X (https://www.youtube.com/watch?v=fI1-UJvgGMc) or WRAITH Legacy product, however, MTW-308 owners will need the additional part below to replace the included hardpoint adapter and mini-airline.