Monstrum Deadlock Series Dual Ring Scope Mount, 1-Inch

Monstrum Deadlock Series is an aluminum dual-ring scope mount listed in an inline configuration with a 1-inch diameter. Its lightweight unibody design is intended for flat-top Picatinny rails, but confirm the selected mount configuration and scope-tube diameter before ordering.

At a glance

Rigid unibody design uses lightening cuts, according to the listing.
The listing describes custom Picatinny locking bolts for flat-top Picatinny-equipped rifles.
The Deadlock line is described as available in inline, 1-inch offset and 2-inch offset versions, and in 1-inch, 30 mm and 34 mm diameters. These are range-wide options, not proof that this specific selection includes them.
Monstrum states its products are backed by a lifetime guarantee.

Price

$19.99Save 33%

Reference price: ~~$29.99~~

Price checked: Nov 13, 2026

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Pros and cons

Pros

Lightweight aluminum construction suits buyers looking to limit added mount weight.
Dual rings and Picatinny attachment provide a direct scope-mounting setup for compatible rails.
Customer feedback highlights secure attachment, solid scope retention and alignment.

Technical specifications

7 specifications

Identity
Brand	Monstrum
Part number	ZS138
Style	Inline
Scope diameter	1 inch diameter

Dimensions and installation
Weight listed	4.3 ounces
Package dimensions	4.8 x 2.99 x 2.24 inches

Materials
Material listed	Aluminum

What to know before buying

Listing details to confirm

The product details list a weight of 4.3 ounces, while the feature text gives 3.7 ounces for the inline version. The product description also states a 1.5-inch centerline height and a 4–3 oz weight range with other centerline heights, while the listed product details do not specify centerline height. Confirm the selected configuration and its dimensions before purchase.

Who is it for?

A good fit for

Rifle owners needing an inline dual-ring mount for a compatible 1-inch scope tube and flat-top Picatinny rail.
Buyers prioritizing a lightweight aluminum mount and a fixed ring setup.

Less suited to

Buyers who need a confirmed offset or cantilever position, a 30 mm or 34 mm ring diameter, or a particular centerline height without first verifying the selected listing.

Monstrum Deadlock Series Dual Ring Scope Mount, 1-Inch · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.8 / 5 · 969 ratings

5 stars85%85%
4 stars11%11%
3 stars3%3%
2 stars0%0%
1 star1%1%

Customer feedback describes the mount as well constructed and appreciates its secure attachment, scope alignment and retention. One reported account says it maintained zero after 500 rounds, which is an individual experience rather than a guarantee. These perceptions matter to buyers seeking a stable scope setup, but do not independently verify the listing's claims about locking bolts or recoil performance.

Positive themes

Customers praise construction, secure attachment, scope retention and alignment.

Frequently asked questions

What scope tube size is listed for this mount?

The selected product details list a 1 inch diameter. Other diameters are mentioned as options across the Deadlock Series, so check the selected configuration before purchase.

What rail does the mount attach to?

The listing describes attachment to a flat-top Picatinny-equipped rifle using custom Picatinny locking bolts.

What is the mount's centerline height?

The product description gives 1.5 inch for one configuration and mentions other heights for 30 mm versions, but the listed product details do not confirm the selected mount's centerline height. Verify the exact variant.

What is included in the package?

The product description says the mount includes Torx keys and hardware, but no explicit package inventory is supplied here. Confirm the selected listing's box contents.