Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper Black
$1,452.65 at MidwayUSA · 2 stores
In stock
Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper FDE
Precision Reflex, Inc. · Upper Receiver
No ratings yetBest price
$1,470.50at MidwayUSA
Out of stock checked Oct 24, 2026
In stock now instead
- Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper Black $1,452.65at MidwayUSA
- Mk12 Mod 0 SPR Gen II 5.56mm 18" Bbl 1-8 Twist Upper FDE $1,493.45at MidwayUSA
- Daniel Defense AR15 14.5" 5.56 NATO M4A1 RIII URG, FDE $1,476.00at MidwayUSA
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $1,470.50checked Oct 24, 2026 | Out of stock | Buy at MidwayUSA | |
| Brownells | $1,729.00checked Oct 24, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar upper receivers in stock
This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
Mk12 Mod 0 SPR Gen II 5.56mm 18" Bbl 1-8 Twist Upper FDE
$1,493.45 at MidwayUSA · 2 stores
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Daniel Defense AR15 14.5" 5.56 NATO M4A1 RIII URG, FDE
$1,476.00 at MidwayUSA · 4 stores
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Price history
Lowest in-stock price in the last 30 days: $1,470.50 at MidwayUSA. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $1,729.00 | $1,729.00 | $1,729.00 |
| MidwayUSA | $1,470.50 | $1,470.50 | $1,470.50 |
Since Sep 28, 2026.
About this part
The Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper FDE is an 18" 5.56 / .223 upper receiver from Precision Reflex, Inc.. It's sold by 2 stores, from $1,470.50 to $1,729.00. The lowest in-stock price in the last 30 days was $1,470.50 at MidwayUSA.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 18" · Handguards
Specifications
- Manufacturer
- Precision Reflex, Inc.
- Color
- Flat Dark Earth
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
This Mark 12 Mod 0, ready to shoot 5.56 upper is equipped with a 18" Douglas 416 stainless steel barrel 1-7 or 1-8 twist with a fitted Full Auto bolt carrier, flat-top receiver, PRi flip up front gas block front sight and rear sight, rifle length gas tube, a Gas Buster charging handle with big latch, brake and collar. The system also comes with a Gen III Rifle length carbon fiber free float forearm and a full length top rail with PEQ II removable rail section. Black or Flat Dark Earth Finish. Mfg: Precision Reflex, Inc.
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