A good epoxy .
There is a type of glue for every repair.
Depends on the type of plastic. Many plastics have glue made from their solutions. Some can be partially dissolved and joined together by the right chemical, some needs to be prepped with an etching agent to get a glue to stick to them.
Any super glue will bind hard plastic.
I would recommend J B Weld or Araldite for this.
That's a very vague question -'plastic' covers over a hundred different materials !In most cases if it's a rigid plastic, epoxy will cover most repairs. If it's flexible as many plastics are then you have to be more specific about which plastic.
I would think plastic cement.ANS 2 - Epoxy or silicone.
Most plastic do not conduct heat very well, This makes it ideal for handles on pans which makes it Thermoset.
I believe they were a Mauser model dated 1941 with black plastic type handles
You can find the type of glue you need at the upholstery shop. They will be able to advise you on how to make the repair you need. It will probably be a good idea to use both a foam glue, and some upholstery tape to hold it together.
I would use a good epoxy.
On the most bottles of Super Glue it says under the Directions label "Do not use on Fabric" so I would think that wouldn't work too well.
Gorilla glueANS 2 - Epoxy will work and silicone will work.