You also mentioned scopes.
Some folk love certain scopes. I have no real experience to offer, except what I've used.
I have two scopes; a UTG Accushot BugBuster 4-16x44 AO, and, a Winchester Daisy 2-7x32 AO
The UTG is a real nice scope. One of the things that I like most about it is the side turret Adjustable Objective. The Winchester-Daisy is also AO, but, it is adjusted by reaching forward to the front bell, and twisting it around.
The little difference of the side adjustable objective is a big deal! It is so much easier to adjust your focus with a side wheel on that side adjustment turret.
I went with this one, because I was told it let more light in, due to larger diameter.
https://www.amazon.com/UTG-4-16X44-...&sr=8-3-fkmr0&keywords=utg+accushot+bugbuster
This is the no frills version (no illuminated crosshairs), and more compact:
https://www.amazon.com/dp/B005UGIMNQ/ref=sxts_kp_bs_1?pf_rd_m=ATVPDKIKX0DER&pf_rd_p=8778bc68-27e7-403f-8460-de48b6e788fb&pd_rd_wg=Oco3N&pf_rd_r=AZQ4EHRZFQ341NV537NJ&pf_rd_s=desktop-sx-top-slot&pf_rd_t=301&pd_rd_i=B005UGIMNQ&pd_rd_w=yYXJf&pf_rd_i=utg+bugbuster+3-9x32+scope&pd_rd_r=dab8125e-3088-4a7d-a950-730c4d707a36&ie=UTF8&qid=1542075786&sr=1
This version was mounted on a Beeman Chief in a blog report that I followed. That report was by Tom Gaylord, aka, B.B. Pleletier, who is highly regarded elder statesman of air guns.
https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias=sporting&field-keywords=UTG+side+wheel
I was intrigued by the Hawke side adjustabe scopes, with their side wheels, but, they were far out of my budget. Then I found out about these UTG scopes, and, they had side wheels available. Best part: Right in my budget.
So, if you follow the links, look for the side wheels that they'll try to incude as add-ons. Absolutely a slick focus system!
This is the 80mm wheel. That wheel fits the side profile of the scope, without being any taller than the top turret, or lower than the top of the receiver:
Regarding the Winchester-Daisy. It survived about a thousand slams from my Crosman 2100, and it held perfect zero.
It is a $40 dollar scope, adjustable objective, really nice clear glass. This is what I put on the Hatsan, and am looking forward to its use in that capacity.