Golgy reviews the Begadi 4x32 Scope with rails and it is an affordable one given its features. Description is from Begadi... "Compact target sight with a fixed quadruple magnification and illuminated reticle (red, green, blue with 3 brightness levels each).

An open sight (rear sight / front sight) with a light collector is also available for short distances.
Additional accessories can be attached to the 21mm rails on the side.

Technical data:

• Magnification: 4x
• Length: 151cm
• Height: 72mm
• Weight: approx. 464g
• Surface: matt black
• Assembly: Picatinny (21-22mm)
• Battery: CR2032 (included)
• Recommended eye relief: 3-4cm

Special features:

• full and precise setting options for the scope
• switchable illuminated reticle
• 3 brightness levels per lighting color
• fixed 4x magnification of the scope
• stable assembly
• shockproof
• no special care required (please clean the glasses with a microfiber cloth or similar)
• 2x 21mm rails on the scope for attaching additional accessories
• rear sight and front sight for short distances (with light collector)
• Killflash made of aluminum, to protect the optics (can be removed)"