Primary Arms

Primary Arms SLx Full Size 3X Magnifier

All Primary Arms magnifiers
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

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Build history on GunPartPicker

Builders have added the Primary Arms SLx Full Size 3X Magnifier to their builds on GunPartPicker. Since April 2026, it ranks #54 of the 86 magnifiers builders have added. Builds with this magnifier are mostly chambered in 5.56 NATO (69%, then .223 Wylde 23%), mostly on mid-length gas (60%, then carbine-length 20%), and nearly all AR-15.

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Frequently Built With

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

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

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

Optic$150in 27% of them
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 27% of them
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$974 · out of stockin 18% of them
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 45% of them
Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride

Diamondback Firearms 5.56 AR-15 Bolt Carrier Group - Nitride

Bolt Carrier Groupin 27% of them
Magpul AFG-2 Angled Fore Grip - Black

Magpul AFG-2 Angled Fore Grip - Black

Foregrip$24in 27% of them

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Caliber

69.2%
5.56 NATO69.2%
.223 Wylde23.1%
300 Blackout7.7%

Gas System

60%
Mid-Length60%
Carbine20%
Pistol10%
Rifle10%

Builds Featuring This Part

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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$956.62
DMR 14.5" build
DMR 14.5"		33$2950.37
Carbine 14.5" 5.56 build
Carbine 14.5" 5.56		33$2950.37
range 8" 5.56 build
range 8" 5.56		30$3239.93

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