MSR Spring for plunger pin for UR/SFK (Krinkov) and CR type front sight blocks 18mm - KR-333S

Ensure reliable front sight function on your milled-receiver AK-47 with the MSR Spring for plunger pin, engineered specifically for UR/SFK (Krinkov) and CR-type front sight blocks measuring 18 mm. This precision replacement spring restores proper detent tension in the triangular front sight base, delivering consistent sight alignment and smooth operation under demanding conditions.

Key Features

• Exact OEM fit for Arsenal-manufactured UR/SFK (Krinkov) and CR-type 18 mm front sight blocks on milled AK receivers
• Constructed from high-quality spring steel for long-term durability and resistance to fatigue
• Provides optimal plunger pin tension to maintain front sight stability during recoil and repeated use
• Compact dimensions ensure seamless installation without modifications
• Direct replacement component for maintaining factory-spec performance

Benefits for AK Builders and Maintainers

Worn or lost springs can cause loose front sights, inconsistent zero, or difficult plunger operation. This Arsenal-compatible spring solves these issues by restoring precise detent pressure, improving overall reliability and accuracy of your Krinkov or CR-pattern rifle. Ideal for custom builds, parts kits, or routine maintenance on classic milled AK-47 platforms.

Specifications

• Length: 0.7 in
• Width: 0.12 in
• Height: 0.12 in
• Weight: 0.01 lb
• Compatibility: UR/SFK (Krinkov) and CR-type 18 mm front sight blocks on milled receivers
• Manufacturer: Arsenal (via MSR Distribution)

Why Choose This Product

Choose genuine Arsenal components for your AK project to guarantee perfect fitment and proven reliability. This small but critical spring supports professional-grade builds and keeps your front sight block functioning as intended.

Upgrade your AK front sight assembly today with this essential replacement spring for dependable performance on every range session or outing.