Primary Weapons Systems MK1 5.56x45mm AR Lower, Black - 222M100RM1B
Primary Weapon Systems
Overview
The Primary Weapons Systems MK1 5.56x45mm AR Lower is a complete lower receiver designed for the AR-15 platform, crafted from durable 7075-T6 aluminum, and finished in black. This lower is compatible with the 5.56 NATO caliber, allowing builders to create reliable and precise rifles suited for various shooting applications. It is commonly used in builds featuring a mid-length gas system, making it an excellent choice for those looking to balance performance and recoil management.
Specifications
Primary Weapons Systems MK1 5.56x45mm AR Lower, Black - 222M100RM1B
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Frequently Built With
Based on build data
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Radical Firearms 5.56 Barreled Ar-15 Upper - 16" - Primary Arms Exclusive
Upper Receiver
Wilson Combat Ar-15 Billet Upper Receiver
Upper Receiver
Magpul AFG-2 Angled Fore Grip - Black
Foregrip
Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green
Charging Handle
Geissele Automatics Llc Ar-15 Ssa X Lightning Bow Trigger
TriggerBuild Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
| Product | Category | Times Built Together |
|---|---|---|
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 248 |
| Radical Firearms 5.56 Barreled Ar-15 Upper - 16" - Primary Arms Exclusive | Upper Receiver | 185 |
| Wilson Combat Ar-15 Billet Upper Receiver | Upper Receiver | 183 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 168 |
| Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green | Charging Handle | 155 |
| Geissele Automatics Llc Ar-15 Ssa X Lightning Bow Trigger | Trigger | 150 |
| Platform | Percentage |
|---|---|
| AR-15 | 100% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 71.3% |
| .223 Wylde | 10.1% |
| 300 Blackout | 6.6% |
| .308 Win | 3.3% |
| 9mm | 2.1% |
| .450 Bushmaster | 1.2% |
| 6mm ARC | 1.2% |
| 7.62x39mm | 0.9% |
| 6.5 Grendel | 0.8% |
| .458 SOCOM | 0.6% |
| .350 Legend | 0.3% |
| 6.5 Creedmoor | 0.3% |
| .45 ACP | 0.2% |
| .223 Remington | 0.2% |
| .204 Ruger | 0.1% |
| .224 Valkyrie | 0.1% |
| .50 Beowulf | 0.1% |
| 5.7x28mm | 0.1% |
| 6.8 SPC II | 0.1% |
| 7.62x51 NATO | 0.1% |
| 8.6 Blackout | 0% |
| .22 ARC | 0% |
| .22 LR | 0% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 49.9% |
| Carbine | 24% |
| Rifle | 13.2% |
| Pistol | 11.4% |
| Blowback | 1.2% |
| Intermediate | 0.2% |
| Proprietary | 0.1% |
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