Nikko Stirling MountMaster AO .375-inch 4-12X50 Rings and RCS Scope

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ITEM# 16980909
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ITEM#: 16980909

The AO series features a very strong .375 inch dovetail mount ring. Additionally, a recoil stop screw is added that allows the mount to be secured to powerful airguns without fear of shifting under the sharp recoil of the spring release.

  • Brand: Nikko Sterling
  • Model: MountMaster AO
  • Color: Black
  • Magnification: 4-12x
  • Objective diameter: 50mm
  • Field of view: 30.6-10.2 at 100yds
  • Eye relief: 3.25 inches
  • Lens coating: Multi coated
  • Body material: Aluminum
  • Weight: 14.2 ounces
  • Dimensions: 14.8 inches long x 1.97 inches wide x 1.97 inches high


Material Aluminum
Color Black
Dimensions 14.8x1.97x1.97
Warranty Limited Lifetime
Model Number NMM41250AO
Country of Origin China

Questions & Answers

  • Q:

    "would this item will be able the recoil of 2.23/556 ammo shooting with ruger mini 14?"

    • A:

      Yes, the Nikko Stirling MountMaster will work with a ruger mini 14 with 2.23/556 ammo.

Shipping & Returns

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Our standard shipping method is ground shipping. We also offer expedited shipping for most items. Your final shipping cost and estimated delivery timeframe will be available at checkout.
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Standard Return Policy:

Items must be returned in new or unused condition and contain all original materials included with the shipment. More Details

FINAL SALE EXCLUSION: Items marked as FINAL SALE are not returnable unless the problem you experience is the result of our error.

For your protection, all orders are screened for security purposes. If your order is selected for review, our Loss Prevention Team may contact you by phone or email. There may be a two business day delay to process your order.

** Most Oversize orders are delivered within 1-4 weeks. Some orders may take 6 weeks to be delivered.