Primary ArmsAll Primary Arms magnifiers

Primary Arms SLx Full Size 3X Magnifier

Primary Arms SLx Full Size 3X Magnifier - Magnifier - view 1

Primary Arms

Overview

The Primary Arms SLx Full Size 3X Magnifier is designed to enhance your sight picture by providing a 3X magnification, allowing for better target acquisition at varied distances. This full-size magnifier is compatible with a range of optics, making it a versatile addition to your setup. It commonly appears in builds featuring a mid-length gas system and chambered in 5.56 NATO, making it a solid choice for those looking to optimize their AR-15 performance.

Specifications

MPN510012
Magnification3x
ColorBlack
SizeFull Size

Available Merchants

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Build history on GunPartPicker

Builders on GunPartPicker first added the Primary Arms SLx Full Size 3X Magnifier to a build in February 2026. Builds with this magnifier are mostly chambered in 5.56 NATO (73%, then .223 Wylde 18%), mostly on mid-length gas (63%, then carbine-length 25%), and mostly AR-15 (89%, then AR-10 11%).

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Frequently Built With

The part most often added in each category by the 10 builds that include this one

Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock

Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock

Lower Receiver$234 · out of stockin 3 builds
LaserMax Red-Dot Sight 1x22mm 3 MOA Dot - Compact - LM-RRDS

LaserMax Red-Dot Sight 1x22mm 3 MOA Dot - Compact - LM-RRDS

Optic$146in 3 builds
Geissele Automatics AR-15 11.5 Super Duty Stripped Upper Receiver Black

Geissele Automatics AR-15 11.5 Super Duty Stripped Upper Receiver Black

Upper Receiver$1,025 · out of stockin 2 builds
Battle Arms Development Rack Ambidextrous AR-15 Charging Handle - Mod C

Battle Arms Development Rack Ambidextrous AR-15 Charging Handle - Mod C

Charging Handle$80in 5 builds
Magpul AFG-2 Angled Fore Grip - Black

Magpul AFG-2 Angled Fore Grip - Black

Foregrip$24in 3 builds
Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride

Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride

Bolt Carrier Groupin 3 builds

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Platform

88.9%
AR-1588.9%
AR-1011.1%

Caliber

72.7%
5.56 NATO72.7%
.223 Wylde18.2%
.308 Win9.1%

Gas System

62.5%
Mid-Length62.5%
Carbine25%
Rifle12.5%

Builds Featuring This Part

See all 4 →

Builds in the community that include the Primary Arms SLx Full Size 3X Magnifier

BuildPartsTotal
First 5.56 build build
First 5.56 build		14$943.31
DMR 14.5" build
DMR 14.5"		33$2938.67
Carbine 14.5" 5.56 build
Carbine 14.5" 5.56		33$2938.67
range 8" 5.56 build
range 8" 5.56		30$3195.66

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