Laptop ssd thing help

k so i got new laptop

http://www.ebuyer.com/737456-msi-gl6...9s7-16j612-065

love it so far. Seems just inbetween gaming laptop and a normal notebook which is all i ever wanted in a laptop (I also play some old games and BOI so they run fine) ANYWAY ENOUGH ABOUT THAT

the 1tb hdd is pretty shit but the sticker on ze laptop says

PCI-E Gen.3 SSD (optional)

now i only know about normal ssds so im confused but is that an M.2 SSD or another type? and if so can someone link me to a good one to buy WHATEVER IT IS
only want like 128gb then ill probably swap the shitty 1tb hdd out for a normal ssd in the future

thanks
ill also rep ppl who help cos everyone likes rep! just depends whether the like the colour green or the colour red morer :¬:

https://www.overclockers.co.uk/pc-co...olid-state/m.2

would this be ok

http://www.ebuyer.com/743523-samsung...v256hdgl-00000

nvm i cba £100for 256gb

so this one

https://www.overclockers.co.uk/samsu...hd-206-sa.html

but £30 more for 256 is tempting

Is this the m.2 slot???? @scottish;

https://vimeo.com/172917474

Looks like it, not very clear vid tho

slot looks like one then at the end there's a raised screw in bit which i guess is what fixes it in

anyway bought 256gb one and migrated my 1tb to one of my main comps ssds so now i got the comp running on an ssd yay