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Primary Arms
Overview
The Primary Arms SLx 3-18x50mm Gen II Rifle Scope features a first focal plane design, allowing the reticle to scale with magnification, making it easier to estimate range and holdovers at any magnification level. With a variable magnification range of 3-18x and a 50mm objective diameter, this scope provides excellent light transmission and clarity, enhancing target acquisition and precision shooting. The illuminated ACSS APOLLO reticle, designed for .308 and 6.5 Grendel cartridges, is optimized for quick adjustments in varied lighting conditions. This scope is commonly found in precision and varmint hunting builds, where versatility and accuracy are key.
Based on build data

Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Law Tactical AR Folding Stock Adapter Gen 3 - HK
Stock Adapter
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green
Charging Handle
Magpul AFG-2 Angled Fore Grip - Black
Foregrip
Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK
Takedown PinAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 34 |
| Law Tactical AR Folding Stock Adapter Gen 3 - HK | Stock Adapter | 33 |
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 31 |
| Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green | Charging Handle | 26 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 26 |
| Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK | Takedown Pin | 24 |
| Platform | Percentage |
|---|---|
| AR-15 | 83.2% |
| AR-10 | 15.5% |
| AR-9 | 1.3% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 69.6% |
| .308 Win | 10.6% |
| .223 Wylde | 10.6% |
| 300 Blackout | 2.4% |
| 6mm ARC | 1.4% |
| .450 Bushmaster | 1.4% |
| 7.62x39mm | 1.4% |
| 6.5 Creedmoor | 1% |
| .204 Ruger | 0.5% |
| 7.62x51 NATO | 0.5% |
| 9mm | 0.5% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 55.9% |
| Carbine | 21.1% |
| Rifle | 17.1% |
| Pistol | 5.3% |
| Proprietary | 0.7% |
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