PETG, should be easy as PLA. If you use hair clue, you can lower the bed temp down a lot, even a room temp. for small part. ABS would be best, but it has fume, and shrinkage, it's much harder to print. Hope that help.
Vector Veyron 3-12X44 High mount rings Had to sanded off the cover a little bit. https://www.amazon.com/dp/B088JYFPLR/ref=cm_sw_r_cp_apa_glt_fabc_65EGPNB731BS5GWMYE6C?_encoding=UTF8&psc=1