Weaver warranties their rimfire scopes for magnum springer use. I've used their 2x-7x, which has held up on my 48 for about three years and over 5,000 rounds. They have a number of different rimfire scopes. Mine is the one on the left:
https://www.midwayusa.com/s?targetLocation=%2F_%2FN-11397%2B4294967190%3FNp%3D2%26Nr%3DAND%2528p_visib le%253A1%252Ccustomertypeid%253A1%2529%26Nrpp%3D24 %26Ns%3Dp_metric_sales_velocity%257C1%26Ntpc%3D1%2 6Ntpr%3D1&userItemsPerPage=48
For peep sights, I really like this Williams:
Williams FP-GR-TK Aperture Sight
They have several versions of this same basic sight. A tall one, a low one, with or without the target knobs, and aperture or open. These just clamp to the dovetail base on top of the receiver. I use the low line of sight, aperture, target knob version on both my 34 and a Weihrauch HW80. I've shot my 48 with one as well, and it works great there, too.