a BIG one!!!

By any chance is it Malaysian?

Hmmm... it's a Turkish Yatagan isn't it? Popular design in the 19th century. That "S" shaped curved blade is a typical of a knife design of Islamic origin.

But I have a doubt because the handguard isn't a typical Yatagan.

You would be correct there Redneck, it is not a Yatagan, but it is commonly called that.
Lets just say that this is a Commonwealth design, and you have the correct period.
It is also instrumental in the identification of Australian soldiers (a bit cryptic there!!)

Holy $h!t, I have that bayonet....

then you should know what it is then.
Another hint, it comes from the commonwealth service rifle at the end of the 19th century

Chassepot????

Pattern 1860 Sword Bayonet. aka Yatagan Sword Bayonet.

Gotta admit I had to look that up.
It's very interesting that the Commonwealth adopted a blade of a trademark Islamic design.


Next:
Identify this weapon:

your keen there redneck, how do you know you are correct???






Well, none the less you are, so put up a pic, oh, you already have.....


Just for a bit of history

Daewoo K7 submachine gun?

Man you're good at this search thing aren't you?
That's what it is.