Category: MTW

Covers MTW-Spec replicas including MTW, MTW-9, MTW-308 and MTW MK18.

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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FeatureMTW-M4 (Billet, Forged)MTW-9MTW-308MTW-ShotgunArticle Series
Barrel (Inner)AEGAEGAEGAEGAEG
Barrel (Outer)MTWMTWMTWMTW Gen-12MTW
Body PinsReal Steel M4Real Steel M4Real Steel 308Real Steel 308Real Steel M4
Bolt CatchMTWMTWMTWMTWMTW
BuckingAEGAEGAEGMTW Gen-12AEG
Buffer TubeReal SteelReal SteelReal SteelReal SteelReal Steel
Charging HandleReal Steel with modificationReal Steel with modificationReal Steel with modificationMTW Gen-12N/A
Contact Yoke MTWMTWMTWMTWMTW
ElectronicsMTWMTWMTWMTWMTW
EnginesINFERNO/REAPERINFERNO/REAPERINFERNOHAVOCINFERNO/REAPER
Feed Tube1MTW M4MTW M4MTW-308MTW M4MTW M4
Flash Hider14mm CCW14mm CCW14mm CCWMTW Gen-1214mm CCW
Grips2Real SteelReal SteelReal SteelReal SteelReal Steel
Hop up MTWMTWMTWMTW Gen-12MTW
MagazinesMTW/AEGASG EVOMTW/AEGMTW/AEGMTW/AEG
Rails3AEGAEGAEGMTW Gen-12AEG
Receiver (Lower)MTW M4MTW-9MTW-308MTW-308MTW M4 
Receiver (Upper)MTW-M4MTW-M4MTW-308MTW Gen-12MTW-M4
Selector Switch MTWMTWMTWMTWMTW
Springs, Pins and DetentsReal Steel M4Real Steel M4Real Steel M4Real Steel M4Real Steel M4
Triggers MTWMTWMTWMTWMTW
WRAITH Stocks MTWMTWMTWMTWMTW
  1. Three generations of feed tube exist. For more details, see this article. ↩︎
  2. If storing battery in or running air line through grip, modification is needed. See video. ↩︎
  3. MTW barrel nut only compatible with MTW rails. Most AEG rails and Real Steel barrel nuts are compatible. ↩︎

FRAC Installation

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.

308/Shotgun Firmware Configurations

The MTW-308 is shipped with a the standard MTW Spartan Electronics Control Board with dedicated 308/Shotgun firmware. This firmware includes two configurations: “308 Mode” and “Shotgun Mode.” The MTW-308 is set to “308 Mode” from the factory, but it is possible to change the mode accidentally and enter “Shotgun Mode,” which features additional dwell (a longer release of air) only suitable for shotgun builds. You can tell which configuration your MTW is set to by listening to the sound of the dwell. See the examples below.

308 Mode

Shotgun Mode

The configuration can be toggled between the two modes by holding down the trigger for at least 15 seconds. The MTW may fire or make a small click to let you know the mode has been changed.

NOTE: The MTW may also fire after 5 seconds, indicating the select fire mode has been changed. Continue to hold the trigger until the 15-second mark and the gun fires or clicks. If you desired, you can then set your fire mode as desired by holding down the trigger for 5 seconds. See this article for more information: https://www.wolverineairsoft.com/knowledgebase/mtw-spartan-electronics-for-mtw-spec-fire-modes/