The link has a bunch of referral garbage attached, that's not permitted, the link should be: https://www.amazon.com/dp/B00200E0HM/

Question 2) There are lots of options for your HammerliTac. They use standard picatinny rails, which means any amount of scopes, dots, new sights, etc can be added with ease.

For an inexpensive but solid reddot, look at a TRS-25

Pretty much anything that will go on a picatinny rail will fit on your HammerliTac

(edit: removed scope...missed that it was a weaver not a pic)

Looks great man, and check this out. I think it would serve you well, a used one is only like $50. Bushnell Trophy TRS-25 Red Dot Sight Riflescope, 1x20mm, Black https://www.amazon.com/dp/B00200E0HM/ref=cm_sw_r_cp_api_glt_fabc_SPZHDQEPJR4W35ZBJA9Q

Bushnell TRS-25 - 78 bucks

https://www.amazon.com/Bushnell-Trophy-TRS-25-Riflescope-1x25mm/dp/B00200E0HM

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It isn't going to make anyone jealous at the range but I have these fitted to an AK and AR both performing well. For a budget optic, dont think you can get any lower without getting one of those weird Chinese rigs.