Does the Primary Weapon Systems MK1 Mod 2 Pistol work with the Primary Weapon Systems MK109 Mod 2-M 300?
Lower Receiver
Primary Weapon Systems MK1 Mod 2 Pistol
from $629.95
Upper Receiver
Primary Weapon Systems MK109 Mod 2-M 300 AAC Blackout
from $1299.95
Primary Weapon Systems lower and Primary Weapon Systems upper compatibility
Yes, they fit
The Primary Weapon Systems MK1 Mod 2 Pistol works with the Primary Weapon Systems MK109 Mod 2-M 300 AAC. Our compatibility rules found no conflict between them.
No one has built this exact setup yet, but Primary Weapon Systems lowers with Primary Weapon Systems uppers are a common pairing.
Counted from real GunPartPicker builds: parts lists people put together while planning to buy.
Checked by the same rules the AR builder runs on every part you add: caliber, frame size, receiver pattern, thread pitch and gas length.
Fit is judged from the specs retailers list, which can be missing or wrong. Confirm with the manufacturer before you buy, and have a qualified gunsmith check any build before you fire it.
How often builders pair the Primary Weapon Systems lower and Primary Weapon Systems upper
Backed by tens of thousands of qualified builds that have both a lower and an upper.
How we count ⌄
These shares come from GunPartPicker's build data: real parts lists people put together while planning a purchase, not sales or surveys. A build counts a part only when it is the final pick for its slot, so parts that were swapped out never count. Fit never comes from these numbers; it comes from our compatibility rules alone.
Frequently built with the Primary Weapon Systems lower and Primary Weapon Systems upper
The part builders pick most often in each slot alongside these two, checked against both. Parts that conflict are left out.
Primary Weapon Systems MK1 Mod vs Primary Weapon Systems MK109: specs and prices
| Primary Weapon Systems MK1 | Primary Weapon Systems MK109 | |
|---|---|---|
| Best price | $629.95 at BattleHawk Armory | $1299.95 at BattleHawk Armory |
| Stores | 0 of 1 in stock | 2 of 4 in stock |
| Assembly | Stripped | Complete |
| Platform | AR-15 | AR-15 |
| Trigger Pin | .154 | n/a |
| Finish | Hardcoat Anodized | n/a |
| Gas System Length | n/a | Pistol |
| Caliber | n/a | 300 Blackout |
| Length | n/a | 9.75 |
Both for $1929.90 at today's best prices.
Today's best prices and 90 day price history
Every store we track for each part, cheapest in stock first. Prices are checked through the day.
Price history, last 90 days
- Primary Weapon Systems MK109 Mod 2-M 300: lowest $1299.95 on Jul 5, highest $1605.99 on Sep 27 over the last 90 days.
Upper Receivers most paired with Primary Weapon Systems lowers
The Primary Weapon Systems MK1 Mod 2 Pistol is not in enough builds yet, so these are the most picked next to any Primary Weapon Systems lower. Only parts our rules say fit the Primary Weapon Systems MK1 Mod 2 Pistol are listed.
Lower Receivers most paired with Primary Weapon Systems uppers
The Primary Weapon Systems MK109 Mod 2-M 300 is not in enough builds yet, so these are the most picked next to any Primary Weapon Systems upper. Only parts our rules say fit the Primary Weapon Systems MK109 Mod 2-M 300 are listed.
