This is probably way to advanced for me. Obviously since I’m not even sure if this is plausible. The picture I attached attempts to explain what motions I want to be preformed by the robotics. I’m working on a secret project and don’t want to give away what I’m doing. Hopefully I can find out if this is plausible and how I might go about starting it. I need to know how to make something like a robotic arm that pivots as well as having arm parts that slide back and forth on eachother and even arm parts that slide on eachother and need to be able to pivot as well. TOTAL NEWB by the way. Please take care of me! 
Without knowing more about the project, it’s difficult to suggest options. Can you give us an estimate of size? Does it have to carry a load at the end? Is this for animatronics or cosplay?
Does the actuation need to be electrical or can you use wires and guides?
It’s for a cosplay weapons prop. I’ll just go ahead and say what it is. I just wanna be the first to do it first. I don’t think anyone has done it yet but I’m probably wrong anyway lol its Ruby’s weapon Crescent Rose from RWBY
It can’t be hydraulics, or spring loaded if I being it to conventions
Essentially:
youtube.com/watch?v=IR90sn8poXk
youtube.com/watch?v=sobmt326ZXA
youtube.com/watch?v=xFxlelzHtCU
There seems to be quite a lot online about how others have made it folding.
The main option you have is therefore a (tubular) linear actuator and some RC servo motors (unless you can integrate it all into the handle).
You’ll likely need pulleys and to create a functional skeleton.
robotshop.com/en/tubular-actuators.html
robotshop.com/en/firgelli-actuators.html
Thank you so much for all the help so far. 
I’m not sure if this is relevant or even how well this would work. But I plan to make a foam scythe first but then I’ll be sticking the individual peices of foam into fine grain sand and pouring melted aluminum into it. I’ll be making the body of the scythe with aluminum peices probably about 1/4th of an inch thick for each piece to hopefully have some stability in the metal so it doesn’t bend. I want to make the scythe as accurate as possible exept no shooting mechanism. I want to add sound effects for it though. For unfolding and shooting.
Weight will be your enemy in this case. We suggest designing the mechanism first, and once that is functional, add the foam, re-test with the new weight, and only then see if the setup is strong enough to be covered in metal.
yeah, I could always use plastic for a few of the scythe pieces to try and lighten the weight afterwards if the metal would be to heavy. the biggest problem would probably be where the scythe connects to the sniper rifle. I imagine the actuators and such will have a specified weight limit on them. So linear actuators for the push and pull motions. Would I be able to use the rc servo motors in close proximity to the linear actuators? ( like where the box rotates and the spear like head comes out.) I was also curious if you could explain where I would use pulleys. I also wanted to know if I would be able to fix a control panel located somewhere on the sniper rifle. Where the scythe would do it’s transformations depending on what button is pushed or how many times a button is pushed. I would like to make this work as closely as possible to the animation if possible.
sorry if I ask a few stupid questions xD
With the linear actuators and rc servo motors would I be able to connect them to work together and how much power would they need? As well as how I would power them. would an external or internal power supply work better?
one other thing I thought of. Is there a linear actuator that has two moving parts instead of one? I’m making the whole scythe in a 3D program and I started making the skeleton to get and idea of placement etc. the spear head part may have to be a bit different than the animation if there isn’t. it’s not that much of a problem. but this is what I have so far.
Valid question indeed - at this time we do not carry any, but they are sure to exist somewhere. Note that weight is a critical factor, so try to make some quick torque / force calculations before physically building it (“measure twice cut once”).
Power depends on the actuators chosen.
A 6V battery perhaps on your belt or within the handle? If you only use 12V linear actuators, an 11.1V LiPo is best.
You’ll ideally need to choose the exact components during the design process.
Okay cool. I’m gonna try to do as much as possible using my 3D program to do that.
After figuring out some placement I’ll be able to use real world measurements and such to size the skeleton and sniper scythe
A friend of mine told me that I would probably need ball joints. Would you agree? and what would I theoretically use it for in the functional skeleton? Also is there anything that will rotate and do linear motion? On the back end of the scythe the box part is supposed to slide against the side of the piece and then rotate to a 45 degree angle and then push out the blade.
It really depends on your design. Try considering mechanical systems to achieve the motion.
Unfortunately we do not have a two-in-one linear + rotary actuator.