TargetTalk

I have a Morini CM84E/NSRA Longarm version (UK legal version must be 600mm Long). I am struggling to remove the compensator from the barrel. Its held on with a 2.5mm Grub Screw and the Allan Keys are bending with the force generated in an attempt to remove it. Is there a knack to this or should I just heat up the compensator - thinking boiling water as don't really want to apply direct heat.

I'm not a gunsmith, just a machinist, but this is how I would approach it.

Try a penetrating oil first - Kroil is the best (IMHO), but it may not be available over there. Let it soak over night before having a go at it. The important thing is to avoid twisting the hex key in the socket - once the hex socket is gone from the screw, you will need professional help.

If the grub screws are held in with Loc-Tite or something like it, you will most likely have to apply heat. I doubt boiling water will be effective. Touching the tip of a soldering iron to the screw should work (I've done that) and with a little care won't get anywhere near the temperature required to alter the barrel temper. If there is Loc-Tite on the thread, you will see a little smoke as it cooks off (I think around 200 C). I've also heard that Loc-Tite makes a solvent, but I've never used it.

Good luck.

Roger

No oil or soldering iron at home so I tried the boiling water (hoping for different coefficients of expansion on the screw and the compensator) and it worked all sorted.

Oh, sure, do it the easy way.

I guess working in a shop, I'm biased towards using the tools at hand - a soldering iron is more convenient for me than boiling water.

I'm glad it worked for you. If you do decide to use Loc-Tite on any grub screws in the future, be sure to get 220 or 222 which are designed for smaller fasteners and take much less torque to break loose than the other formulations.

Roger