Sightmark Core Shot A-Spec FMS 1x28x18mm Red Dot Sight - SM26017

Sightmark Core Shot A-Spec FMS 1x28x18mm Red Dot Sight - SM26017 - Optic - view 1
Sightmark Core Shot A-Spec FMS 1x28x18mm Red Dot Sight - SM26017 - Optic - view 2
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Sightmark

Overview

The Sightmark Core Shot A-Spec FMS is a robust red dot sight designed for quick target acquisition and enhanced accuracy. Featuring a durable aluminum construction and a red reticle, this optic is optimized for use on firearms equipped with a Picatinny mounting interface. Builders often incorporate this sight into mid-length gas system AR-15 builds chambered in 5.56 NATO, making it a practical choice for a variety of shooting applications.

Specifications

MPNSM26017
Reticle ColorRed
MaterialAluminum
Optic TypeRed Dot
Mounting InterfacePicatinny

Available Merchants(7)

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Frequently Built With

Based on build data

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Platform

89.5%
AR-1589.5%
AR-107.9%
AR-92.6%

Caliber

83.3%
5.56 NATO83.3%
.223 Wylde11.1%
6.5 Grendel5.6%

Gas System

61.5%
Mid-Length61.5%
Carbine23.1%
Pistol7.7%
Rifle7.7%
Frequently Built With Products
ProductCategoryTimes Built Together
Weaver Multi-Slot Base - 4840021
BLEM PSA AR15 Complete Classic Stealth Lower, BlackLower Receiver20
NcStar Pro Series Sight Front/Rear Flip Up, Black - VMARFLC19
Geissele Automatics Llc Ar-15 Ssa-E X Lightning Bow Trigger16
Magpul AFG-2 Angled Fore Grip - Black16
Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers13
Build Platform Breakdown
PlatformPercentage
AR-1589.5%
AR-107.9%
AR-92.6%
Build Caliber Breakdown
CaliberPercentage
5.56 NATO83.3%
.223 Wylde11.1%
6.5 Grendel5.6%
Build Gas System Breakdown
Gas SystemPercentage
Mid-Length61.5%
Carbine23.1%
Pistol7.7%
Rifle7.7%

Builds Featuring This Part

See all 11

Builds in the community that include the Sightmark Core Shot A-Spec FMS 1x28x18mm Red Dot Sight - SM26017

BuildPartsTotal
16" 5.56
28$1904.00
aero precision 16" build
15$1124.34
for hd 14.5"
8$1205.94
First 5.56 build
14$730.04
For prs 14.5"
24$4840.34
16" 5.56
12$3476.19
aero precision 16" build
29$1939.91
For night work 14.5"
18$2253.54
PSA 16" 5.56
14$954.40
aero precision 14.5" 5.56
27$1750.63
BCM 16" build
11$2007.30

Customer reviews

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1 global rating

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Top reviews

F
frankieHudman
Sightmark Core Shot zero held
Reviewed on March 24, 2026Verified with Build

Sightmark Core Shot A-Spec FMS red dot has clear glass with no edge distortion. Zero held through a 500 round day. Battery life is good on auto-off mode. Reticle is crisp at 2 MOA. Solid budget red dot for any build.

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