SAG MK3 SLIM Chassis - 4-Slot M-LOK with Rear Sight Cutout (CNC Aluminum)

Name: SAG MK3 SLIM Chassis - 4-Slot M-LOK with Rear Sight Cutout (CNC Aluminum)
Brand: SAG (Sureshot Armament Group)
SKU: SAG-S20050
Price: 1349 USD
Availability: InStock

Brand: SAG (Sureshot Armament Group)

Product Code: SAG-S20050

Availability: In Stock

SKU: SAG-S20050

MPN: SAG-S20050

$1 349.00
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SAG MK3 SLIM Chassis - 4-Slot M-LOK with Rear Sight Cutout

In short: A slim CNC-aluminum free-float chassis with a 4-slot M-LOK handguard and a rear sight cutout that keeps the factory rear sight in use.

Overview

The MK3 SLIM is the narrow member of SAG's chassis family. The handguard is a slim tube with 4-slot M-LOK panels, sized for shooters who want a thinner grip surface than a full-diameter handguard gives. The barrel free-floats inside it.

This is the RSB version: the top rail has a cutout for the rear sight base, so the factory rear sight stays in place and remains usable as a backup behind an optic. If you would rather have an uninterrupted rail and no iron sights, the full-rail equivalent is the S20048.

The top rail is a 1913-MIL-STD monorail from the gas block to the shortened cover, with a further 1913 segment on the removable rear cover section. The chassis is CNC-milled high-strength aluminum alloy with steel inserts and fasteners, and it can be removed and reinstalled on another carbine later.

Installation Note

Installation requires removing the factory handguard ferrule. This chassis is not suitable for self-installation on full-size carbines built on certain Molot Arms AK-pattern receivers (MA-136-02, MA-136C, MA-136-05); those require a specialist workshop. Install in accordance with the manual.

Key Advantages

Slim 4-slot M-LOK handguard - lightweight, low-profile grip
Rear sight cutout (RSB) - retains the factory rear sight
Free-floats the barrel - inside a tubular handguard
1913 top monorail - gas block to shortened cover, for optics and lighting
No removal for cleaning - front rail stays on during field-stripping
Folding-stock compatible - stock folds fully for transport
Removable rear cover rail - for magnifier or NV attachment
Reusable - can be reinstalled on a new carbine

Technical Specifications

Material	High-Strength Aluminum Alloy (CNC-milled); steel inserts & fasteners
Product Code	SAG-S20050
Handguard	Slim, 4-slot M-LOK
Rear Sight	Rear sight cutout (RSB) - retains factory rear sight
Top Rail	1913-MIL-STD monorail (gas block to shortened cover)
Rear Cover Rail	1913-MIL-STD segment (removable section)
Barrel	Free-floating inside tubular handguard
Reusable	Can be reinstalled on a new carbine

Compatibility

Designed for full-size sporting platforms. See the compatibility filter on this page to confirm fitment for your specific platform.

What's in the Box

(1) SAG MK3 SLIM Chassis (4-slot M-LOK, RSB)
(1) Mounting Hardware Set
(1) Installation Manual

Frequently Asked Questions

What does the rear sight cutout do?

It preserves the factory rear sight so you keep your iron sights after installing the chassis.

How is the SLIM version different?

It has a narrow 4-slot M-LOK handguard for a lighter, lower-profile grip compared to the wider chassis versions.

Does it free-float the barrel?

Yes - the chassis free-floats the barrel inside a tubular handguard.

Do I need a specialist?

Most installs require only removing the handguard ferrule. Certain Molot Arms AK-pattern full-size carbines require a specialist workshop.

How does shipping work?

US orders are fulfilled and delivered through our partner's domestic US logistics network. Delivery is not express, but it is reliable and fully guaranteed.

Is this a genuine SAG part?

Yes. Bazalet is an official dealer and every item is supplied by Sureshot Armament Group.

Go Slim, Keep Your Irons

In Stock Guaranteed US Delivery CNC-Machined Quality