Weaver Top Mount Base #90 — Marlin 39A/39D, Gloss Black

This Weaver one-piece top-mount scope base (#90) is machined from aluminum to tight tolerances for a precise fit. Designed to accept Weaver-style rings, it features the Weaver cross-lock interface to hold rings securely. The base is finished in gloss black and fits Marlin 39A/39D receivers. Rings and mounts are sold separately.

Key Specifications

• The model number is #90 and it is a 1-piece top-mount base.
• The compatible fit is Marlin 39A, 39D receivers.
• The material is aluminum for a balance of strength and weight.
• The finish is gloss black for a low-profile appearance.
• The base uses the Weaver cross-lock interface for ring engagement.
• Required rings are Weaver-style; rings are not included.
• The listed overall dimensions are 0.60 x 3.35 x 7.55.
• The product height is 0.6000, width is 3.3500, and length is 7.5500.
• The elevation is specified as 0 MOA.

This base provides a durable, accurately machined platform for mounting optical sights on compatible Marlin lever-action rifles. Its Weaver-style interface gives a dependable, repeatable seating for rings, making it a practical choice for hunting, range use, or general sight mounting needs where a secure, one-piece top mount is preferred.