So I have a character who uses various portals to store and deploy his weaponry and tools. These portals are 2 dimensional portals like those of the game Portal. I have had little trouble with this idea until a situation popped in my head. So my character has a weapon, like a pistol but the barrel is replaced with a square plate with a portal where a barrel of a big railgun would stick through and that railgun is anchored to the ground in some remote location, if someone or something were to push on the railgun barrel or whatever object was poking through (the portal can move to different equipment to poke through my character’s side), would it be perceived as pushing against the ground or would my character feel the force? The railgun which pokes through the portal is big and heavy and is attached to the floor itself with only the muzzle poking through the portal.
I would imagine that the weight of the handheld device would increase only by the portion of the barrel sticking through the portal. The railgun has little recoil since it is a rail gun but any recoil it does experience wouldn’t translate to the character right, since it is distributed into the floor from the base? If it doesn’t then does an external push on the muzzle translate to the character or does my character have an immovable object if the portal connects to an immovable concrete wall?
I don’t know if this is breaking the rules in terms of asking to many questions or if it isn’t Worldbuilding or if the only good answer is to make the rule up myself for whatever seems right but my main question is what should happen if someone pushes on the muzzle of the gun, if my character would feel any force, based on physics.