Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper Black

Name: Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper Black
Brand: Precision Reflex, Inc.
Availability: InStock

Precision Reflex, Inc. · Upper Receiver

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Best price

$1,452.65at MidwayUSA

In stock checked Oct 21, 2026

Buy at MidwayUSA

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Where to buy

Store	Price	Availability	Buy	Add to build
MidwayUSA Best price	$1,452.65checked Oct 21, 2026	In stock	Buy at MidwayUSA
Brownells	$1,709.00checked Oct 21, 2026	In 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.

Price history

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Lowest in-stock price in the last 30 days: $1,452.65 at MidwayUSA. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Brownells	$1,709.00	$1,709.00	$1,709.00
MidwayUSA	$1,452.65	$1,452.65	$1,452.65

Since Sep 27, 2026.

About this part

The Mk12 Mod 0 SPR Gen III 5.56mm 18" Bbl 1-8 Twist Upper Black is an 18" 5.56 / .223 upper receiver from Precision Reflex, Inc.. It's sold by 2 stores (2 in stock), from $1,452.65 to $1,709.00. The lowest in-stock price in the last 30 days was $1,452.65 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: Black
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 18"

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.