It can be done. Requires a certain level of disassembly, but I've done it before.
1. Unbolt DDM4 Rail and Remove
2. Loosen Barrel Nut. This can be done without removing your gas tube buy you may find it easier if you remove the tube first OR knock out the taper pin on your gas block and slide it forward and out of the way.
3. Remove Barrel from your Upper and remove the DDM4 Bolt Up Plate.
4. Install MFR XS Bolt Up Plate and reinstall your barrel assembly torquing your barrel nut to 50-55 ft/lbs.
5. Reinstall your gas tube or gas block if you removed it during Step 2.
6. Slide the Bolt Up Collar over your barrel, gas block, and gas tube. Yes, it will clear it all.
7. Install your MFR XS, align it to the upper receiver and tighten the bolts.
There is no need to remove your flash hider to execute the swap. This will also work on the V11 SLW as well as the V5S where you have a pinned muzzle device. For these guns, we'd recommend the 13.5 option.
S/F
Joe