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Riflescopes > Accessories > Mounts > Seben > Seben Aluminium Scope Ring Mount Reducers (30mm to 25.4mm 1") Inserts RSM04
( 5 / 5 )
Product no.: 59902

Aluminium Scope Ring Mount Reducers (30mm to 25.4mm 1") Inserts RSM04

$ 10.90 incl. VAT, plus shipping costs
in stock
ready for shipping in 24 h + lead time
Express shipment possible for delivery tomorrow, 10.06.2023!

Product description

Seben Scope Ring Adapters Reducers RSM04 for downsizing 30mm diameter scope rings to 25.4mm (1") Important information about our assortment for hunters and sport shooters:

Seben has been delivering high-quality products to the whole world for more than a decade. Our customers include not only thousands and thousands of hunters and sport shooters, but also many famous institutions, which decided upon our products after extensive testing.

Please be aware that lately the market has been flooded with a great variety of products. However, often low-quality products are hiding behind these offers. Therefore rely on Seben products, which have already proven their worth thousands of times!

Item description:

These extremely robust aluminium scope ring reducers permit the combination of 25.4mm (1") rifle scopes, red dot sights, lasers, etc. with 30mm ring mounts.

The reducers are made in the form of a half-shell to fit tightly and guarantee very sturdy mounting.


  • Weight: 24g (6g per half-shell)
  • Width: 25mm
  • Diameter: 25.4mm (1")
  • Material: all-aluminium

Compatible with the following parts (not included in the delivery):

  • Rifles scopes with a central tube diameter of 25.4mm (1")
  • 30mm ring mount

Contents of delivery:

This is for 1 set of 4 pieces - enough for 2 mounts ("adapters" only – not mounts.)


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*All prices include VAT plus shipping costs.

Seben Aluminium Scope Ring Mount Reducers (30mm to 25.4mm 1") Inserts RSM04
Seben Aluminium Scope Ring Mount Reducers (30mm to 25.4mm 1") Inserts RSM04

Customer reviews

I'm so glad I found these

Review by N. S. on 21.02.2023 14:17:36

( 5 / 5 )

Anywhere else I looked I could only find plastic reducer rings, and none of them were the right width. These are 1 inch wide, so they fit perfectly into my scope rings. They are high quality aluminum and fit very snug when everything is tightened up, especially because of the coating that all scopes and rings regularly come with (the standard matte black powder coat I assume).

I have yet to go sight in my scope, so I can't comment if these hold the scope in place yet, but if these fail to work I'll come update my review. If no update, they work. Based on the feel of quality, I highly recommend these over any plastic reducer rings. Great price, and decent ship time to Canada. Thank you optics-pro!

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