For the Montefeltro you have to remove the magazine tube to remove the magazine spring.
Like the M4 magazine tube removal.
Secure the disassembled receiver in a padded vise.
Make an index mark on the receiver / magazine tube with silver sharpie or similar marking device.....this will allow you to restore the magazine / receiver engagement exactly as it was assembled. This must be done because the barrel headspaces off the magazine tube and if it comes unscrewed the barrel will move forward out of battery.
Use a heat gun for several minutes directed at the engagement of the magazine tube with the receiver - this will melt / release the factory Locktite.
Rotate the magazine tube counterclockwise (right hand threads) with heat protective gloves.
The magazine tube, magazine follower, and a magazine spring guide (for the muzzle end of the tube) will then be liberated.
For re-assembly apply blue locktite to the last 1/2 of the magazine tube threads; this will make secondary magazine tube removal much easier, probably by hand alone.
