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Kinetic Development GroupHandguardsPremium

KDG SCAR MREX MkII 4.25 M-LOK Rail

Mid-length MREX MkII for FN SCAR 16/17 builds that need useful forward M-LOK space without the weight of the 6.5-inch rail.

Price: $360
Weight: 8.1 oz
Brand: Kinetic Development Group
Category: Handguards

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Featured in

Best FN SCAR 17 Accessories 2026 (+ SCAR 16)

guide · gear · 11 min read

Features

•4.25-inch extension; 11.08 inches overall
•7 oz rail plus 1.1 oz mounting hardware
•6061-T6 aluminum
•Black Type III hardcoat or FDE Cerakote
•Fits FN SCAR 16 and 17

Capability Boosts

Modularity+2

Recommended For

Duty/Patrol+2

duty+2

Competition+2

customization+2

Where to Buy

Compare current prices and availability from retailers we work with.

RetailerPriceAvailabilityUpdatedShop

Palmetto State Armory

Kinetic Development Group 4.25" SCAR MREX M-Lok MKII Handguard, Black - MRX5-MK2-030

$309.99

Unknown

12h ago

View offer

Kinetic Development Group

KDG FN SCAR Rail - MREX MkII 4.25

$359.98

Unknown

1d ago

View offer

Price History

90-day low $309.99

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Overview

The MREX MkII 4.25 is the middle SCAR rail: enough length to move a light, laser, grip, or hand stop forward without committing to the 11-ounce installed weight of the 6.5. It measures 11.08 inches overall and weighs 7 ounces plus 1.1 ounces of mounting hardware.

KDG machines it from 6061-T6 aluminum for the FN SCAR 16 and 17. The black catalog SKU is MRX5-MK2-030, while FDE sibling MRX5-MK2-130 shares the selectable page. The separate 2.2 and 6.5 product pages are not interchangeable with this route.