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Questions & Answers
Does this barrel fit an Aero M5 upper receiver?

Yes it should

by Bob T, Verified Owner, January 6, 2026
Color:
Steel
Caliber:
.243 Winchester
Barrel Length:
20 in
Barrel Profile:
Standard
Gas System Length:
Rifle Length
Gas Block Journal Size-Diameter:
.750 in
Barrel Twist Rate:
1-8
Flutes:
Yes
Gun Make:
Rock River Arms
Gun Model:
Universal
Weight:
44 oz
Firearms Threads Per Inch:
5/8x24

Code: 1WN-ATB-RRA0972-243A0222F

MPN: 243A0222F

UPC: 842834102280

List: $449.99Save 22%
$349.99

Product Info for Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel

The Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel was developed in order to be the best item for any person trying to find an outstanding choice..image

Established by using several of the most robust and long lasting materials around, these AR15 Barrels through Rock River Arms provides you with an item which gives you many years of reliability.

Rock River Arms has been making high quality products for a number of years, and the Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel is their way of revealing just how much they care.

Right here at OpticsPlanet, we make it our obligation to obtain the most suitable solution for all of your preferences, and exhibiting the Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel is one thing that we are happy to offer.

WARNING: California`s Proposition 65

Specifications for Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel:

Manufacturer: Rock River Arms
Color: Steel
Fabric/Material: 416R Stainless Steel
Caliber: .243 Winchester
Barrel Length: 20 in
Barrel Profile: Standard
Gas System Length: Rifle Length
Gas Block Journal Size-Diameter: .750 in
Barrel Twist Rate: 1-8
Flutes: Yes
Gun Make: Rock River Arms
Gun Model: Universal
Weight: 44 oz
Firearms Threads Per Inch: 5/8x24

Package Contents:

  • Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel

Rock River Arms .243 Winchester 20in SS Fluted Threaded Barrel Orderable Models

List of Orderable Models

  • Rock River Arms 20in 243 Lar-8 SS, Fluted Barrel, Stainless Steel, 243A0222F , MPN: 243A0222F , UPC: 842834102280 , Code: 1WN-ATB-RRA0972-243A0222F
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