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Primary Weapon Systems
Overview
The Primary Weapons Systems MK1 Mod 2-M Complete AR-15 Lower Receiver is a fully assembled unit designed for builders looking for a reliable foundation for their AR-15 projects. Featuring ambidextrous controls, this lower receiver provides versatility and ease of use for both left- and right-handed shooters. This lower is commonly paired with builds utilizing the .223 Wylde caliber, making it a solid choice for those focused on precision and adaptability in their shooting experience.
Primary Weapons Systems MK1 Mod 2-M Complete AR-15 Lower Receiver - Magpul Furniture
Prices checked
Primary Weapons Systems MK1 Mod 2-M Complete AR-15 Lower Receiver - Magpul Furniture ranked #208 of the 588 lower receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #227 of the 1,222 lower receivers builders have added. Builds with this lower receiver are mostly chambered in 5.56 NATO (70%, then .223 Wylde 20%), mostly on mid-length gas (67%, then carbine-length 17%), and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 3 of the 4 retailers we track have it in stock. Buying today, the lowest price is $589.95 at BattleHawk Armory, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
We ranked every lower receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Lower Receiver Trends →Check it against the live catalog:
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