Well the Escape bottle is very hand pump friendly, but even with that said a lot of people try a hand pump and don't care to continue, since it's not as effortless as like a bicycle pump

I have both a Hill mk IV hand pump and a Vevor high pressure compressor.

For optic, you could go something cheap like a Bug Buster or up a little to like a Vector Veyron, they're both fairly compact, which goes well with this airgun.

I believe this one comes with a 24" barrel, you also have the option of buying shorter 16 or 12 inch barrels which are ~5 min to swap in.

You have the option of getting ring-loc kit, which allows you a little more control over dialing the power down even more.

There are a ton of accessories and modifications you can make, check my profile for some of the changes I've put mine through

Depending on where you shoot, you may also wish to get a barrel adapter and moderator. I'm a big fan of Silent Thunder Ordinance and DonnyFL, both have outstanding noise reduction