UTG Super Slim Picatinny Riser Mount – 21 mm, 13 Slot

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UTG Super Slim Picatinny Riser Mount 21 mm 13 Slot – Picatinny riser for proper sight height

The UTG Super Slim Picatinny Riser Mount 21 mm 13 Slot is a long riser that raises an existing Picatinny rail by about 21 mm. It solves a very specific problem: the optic sits too low, the head has to be unnaturally tilted down, or a magnifier doesn’t align cleanly with the sight line.

The 13-slot version is designed for longer optic/magnifier combinations or multiple Picatinny components. The important thing is not "higher is better," but the right height for cheek weld, stock line, and existing optic.

Why exactly this product?
✔ Raises the Picatinny line by about 21 mm (0.83") ✔ 13 slots – long mounting surface for more adjustment range ✔ 6061-T6 aluminum with matte black anodizing ✔ Torx screws and integrated recoil stops ✔ Useful for red dot, magnifier, or Picatinny-compatible accessories

Why this product?

A riser is not a decorative part but a tool to correct your sight line. It makes sense if the optic sits too low or if multiple optical components need to be aligned at the same height.

You get a more relaxed head position at the cheek weld
You can align red dot and magnifier more cleanly with each other
You create more space above handguards, BUIS, or controls
You continue to use existing Picatinny accessories instead of changing the whole setup

Compact or long – what makes sense?
❌ Too short riser for long setups: little adjustment range and tight positioning ❌ Too long riser for small setups: unnecessary weight and space consumption ✔ This variant: for more mounting surface when optic and accessory are raised together

Instructor tip:
Check before mounting if you really need a 21 mm raise. An optic that’s too high may look modern but can worsen your cheek weld. The ideal height is where you can consistently find the optic without actively searching with your head.

Key features

Picatinny riser with about 21 mm height increase
13 Picatinny slots for a long mounting surface
Scalloped slots for easier accessory mounting
Continuous edge design so multiple risers side by side create a cleaner line
Integrated recoil stops for a more stable fit
Fixed screw mounting instead of quick-release lever

Our assessment

This riser height makes sense if your existing optic line is too low or if an accessory needs to be raised to a higher line. A difference of a few millimeters noticeably changes head position in practice.

The long 13-slot version is clearly more useful when red dot and magnifier or multiple accessories need to be aligned together.

Limit: A riser does not replace a proper base mount. If your optic is fundamentally the wrong choice, a riser only partially solves the problem.

Application areas

Range: raise red dot or magnifier to a more comfortable sight height

AR/PCC setups: improve head position if the optic sits too low

Accessory mounting: light, dot, or other Picat
Mount other accessories with more distance from the base

Setup correction: align existing components without buying a new optic

Features & Operation

6061-T6 aluminum: sturdy enough for normal range and sport use without becoming unnecessarily heavy
Torx screws: secure mounting; check regularly after zeroing
Recoil stops: help secure the mount against shifting on the Picatinny rail
13-slot geometry: determines how much accessory travel and rail space you get

Technical Data

Product type: Picatinny riser – raises an existing Picatinny rail
Height: approx. 21 mm – affects cheek weld and co-witness/magnifier line
Slots: 13 – determines the available mounting area
Material: 6061-T6 aluminum – lightweight, machined mounting material
Mounting: Picatinny – only suitable on clean, dimensionally accurate Picatinny rails
Quick release: no – fixed screw mounting for controlled fit

Scope of Delivery

1x UTG Super Slim Picatinny Riser Mount 21 mm 13 Slot
Mounting screws / tools depending on manufacturer scope

Important note:
Risers change the sight line. After mounting, the optic must be rechecked and re-zeroed for aiming-relevant optics. Do not mount on loose or damaged Picatinny rails.

FAQ

What do I need a Picatinny riser for?
When an optic, magnifier, or accessory sits too low or needs to be brought to a common height.

Is the riser suitable for every red dot?
Only if the red dot or its mount uses a Picatinny interface and the height fits your setup.

Do I need to re-zero after mounting?
Yes, for aiming-relevant optics the point of impact should always be checked and re-zeroed if necessary.

Is the 3-slot or 13-slot version better?
3 slots are compact for single parts. 13 slots make sense if multiple components or longer mounting travel are needed.

Can I fix a wrong stock/optic combination with it?
Only to a limited extent. The riser corrects height but does not replace a fundamentally suitable mount and cheek weld position.

Especially with Picatinny risers, red dot height, and magnifier setup, it’s not the highest mount that counts but the repeatable cheek weld and clean alignment of the optic line.