Faxon Firearms ARAK-21 Complete Upper Receiver | Up to 14% Off 4.4 Star Rating w/ Free Shipping

OpticsPlanet Exclusive Faxon Firearms Complete Upper Receiver, ARAK-21, 16in, 5.56, MuzzLok, Sand, URSSB556-OP-SND

Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P

Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P

Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P

Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P

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Questions & Answers

Does this sand model come with the option for left-side eject? I noticed the product for Upper Receiver Groups 1 appears to. Manufacturer Answer

Yes, the Sand color ARAK-21 is ambidextrous and can be set to eject to the left or right side.

by Faxon Firearms, Manufacturer, August 28, 2025

Can it be modified to work with an ak magazine? Manufacturer Answer

No, the ARAK-21 will not accept or function with AKM pattern magazines.

by Faxon Firearms, Manufacturer, May 28, 2025

View All Q&A You Have a Question? Ask!

Customer Reviews

Helpful Positive Review

Range fire by Michael Esposito, Verified Owner, August 20, 2025

I forgot to give a review after going to the range a few months ago. I've never experienced such a monotonous set of instructions for a barrel break-in. Honestly, I dont understand Faxon's logic behind its break-in requirements. But, they are the en...
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2/2 found this helpful

Helpful Positive Review

Faxon Quality by Michael Esposito, Verified Owner, September 29, 2024

Out of the box, the quality of this upper is exceptional. The milling, finish, design, and function are top shelf. I own many piston uppers and I consider this upper to be the all-around best. I hope my range fire experience is as positive as the un...
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2/3 found this helpful

Helpful Positive Review

Good over all. by Kaz, June 23, 2024

A part of me wants to give this 4 stars. Only because it is advertised as having the ability to quickly change barrels. However finding the shorter or 300 BO is not available anywhere currently. That and the "sand" tone doesn't really match the FDE. ...
Read More...

3/5 found this helpful

Helpful Positive Review

Definitely worth a look by Swift, Verified Owner, December 28, 2024

This upper is an interesting addition to my lineup. In short, consistent groups with a con of weight. Out of the box I had fitment issues. Takedown pins were about a millimeter off. After getting over my initial irritation, i broke down the upper an...
Read More...

11/11 found this helpful

Helpful Positive Review

One of The Best Piston Ars by Payle Ryder, Verified Owner, March 17, 2024

Been researching piston uppers for years and by far the best ive found is the arak21. Came within a week of ordering. Fits any mil spec ar lower. The adjustable gas block makes this a perfect system for suppressors. The long strong piston also reduce...
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19/20 found this helpful

Helpful Positive Review

This rifle spoke to me in Latin by Rusty, Verified Owner, September 22, 2025

Bought the Faxon ARAK-21 upper and the second I attached it to my aero lower, my rifle grew a third eye and started humming the national anthem. It’s not a gun anymore it’s a portal. The recoil feels like a butterfly farted and the charging handle te...
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4/4 found this helpful

Read All 8 Reviews

Let's Start Celebrating Already! Save up to 20% on Faxon Firearms Products

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2 Models Available

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Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P

Caliber:: 5.56mm
Firearms Threads Per Inch:: 1/2x28

Code: 11I-URC-SDF2-URSSB556P

MPN: URSSB556P

UPC: 816341025608

Blazin' Deal

List: ~~$999.00~~Save 14%

$855.60

Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P

Caliber:: 7.62x39mm
Firearms Threads Per Inch:: 5/8x24

Code: 11I-URC-SDF2-URSSB762P

MPN: URSSB762P

UPC: 816341025615

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List: ~~$999.00~~Save 14%

$855.60

Expert Advice Request for Quote Price Match

ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

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Product Info for Faxon Firearms ARAK-21 Complete Upper Receiver

This Faxon Firearms ARAK-21 Complete Upper Receiver is gas piston actuated and designed to seamlessly integrate with your AR15 platform. Faxon Firearms built these AR15 Upper Receivers with an ambidextrous charging handle and safety selector to suit both left and righthanded marksmen. Machined from aircraft-grade aluminum in a one-piece design, these AR15 uppers are incredibly durable and are compatible with folding stocks. The top Picatinny rail is T-marked for precise optic mounting, and the three additional rails make it a complete quad rail upper that can be customized with weapon lights, laser sights, and other accessories. With no change to your lower receiver, you can instantly install the ARAK-21 without the use of tools. Create your perfect AR platform with the Faxon Firearms ARAK-21 complete upper.

WARNING: California`s Proposition 65

Specifications for Faxon Firearms ARAK-21 Complete Upper Receiver:

Manufacturer:	Faxon Firearms
Overall Length:	21.5 in
Barrel Length:	12.5 in
Barrel Profile:	Medium
Gas System Length:	Rifle Length
Barrel Twist Rate:	1-8
Muzzle Device:	Muzzle Brake
Finish:	Multi
Color:	Black
Fabric/Material:	Stainless Steel
Handguard Style:	Quad Rail
Gun Rail:	Quad Rail
Gun Type:	Rifle
Gun Make:	AR Platform
Gun Model:	AR-15
Magazine Included:	No
Condition:	New
Mount Type:	Picatinny

Features of Faxon Firearms ARAK-21 Complete Upper Receiver:

Ambi Non-Reciprocating Forward Charging Handle
Ambi Safety/Selector
Bufferless System
Quad Rail
MuzzLok Muzzle Device
Variable-Setting Gas System
Self-Contained Firing Pin Retention System
Steel Rail System for Bolt Carrier
Caliber Conversions Available

Package Contents:

Faxon Firearms ARAK-21 Complete Upper Receiver
Shipping Box
Manual
BAU Removal Tools
Bolt(s) And Firing Pin(s) for Ordered Calibers
Recoil Spring(s) for Ordered Calibers

What firearm models does the manufacturer say Faxon Firearms ARAK-21 Complete Upper Receiver is compatible with?

The manufacturer suggests that Faxon Firearms ARAK-21 Complete Upper Receiver is compatible with AR-15

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Faxon Firearms ARAK-21 Complete Upper Receiver Orderable Models

List of Orderable Models

Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P , MPN: URSSB556P , UPC: 816341025608 , Code: 11I-URC-SDF2-URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P , MPN: URSSB762P , UPC: 816341025615 , Code: 11I-URC-SDF2-URSSB762P

Faxon Firearms ARAK-21 Complete Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

USED, OpticsPlanet Exclusive Faxon Firearms Complete Upper Receiver, ARAK-21, 16in, 5.56, MuzzLok, Sand, URSSB556-OP-SND , MPN: URSSB556-OP-SND-EDEMO , Code: 11I-URC-SDF2-URSSB556-OP-SND-EDEMO-RE-B
DEMO, Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P , MPN: URSSB556P-DEMO , Code: 11I-URC-SDF2-URSSB556P-DEMO-OB-A
OpticsPlanet Exclusive Faxon Firearms Complete Upper Receiver, ARAK-21, 16in, 5.56, MuzzLok, Sand, URSSB556-OP-SND , MPN: URSSB556-OP-SND , UPC: 816341028098 , Code: 11I-URC-SDF2-URSSB556-OP-SND

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Faxon Firearms ARAK-21 Complete Upper Receiver Up to 14% Off, Blazin' Deal w/ Free Shipping — 2 models

Let's Start Celebrating Already! Save up to 20% on Faxon Firearms Products

Product Info for Faxon Firearms ARAK-21 Complete Upper Receiver

Specifications for Faxon Firearms ARAK-21 Complete Upper Receiver:

Features of Faxon Firearms ARAK-21 Complete Upper Receiver:

Package Contents:

What firearm models does the manufacturer say Faxon Firearms ARAK-21 Complete Upper Receiver is compatible with?

Faxon Firearms ARAK-21 Complete Upper Receiver Orderable Models

List of Orderable Models

Faxon Firearms ARAK-21 Complete Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

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More Deals

Faxon Firearms ARAK-21 Complete Upper Receiver Up to 14% Off, Blazin' Deal w/ Free Shipping — 2 models

Let's Start Celebrating Already! Save up to 20% on Faxon Firearms Products

Product Info for Faxon Firearms ARAK-21 Complete Upper Receiver

Specifications for Faxon Firearms ARAK-21 Complete Upper Receiver:

Features of Faxon Firearms ARAK-21 Complete Upper Receiver:

Package Contents:

What firearm models does the manufacturer say Faxon Firearms ARAK-21 Complete Upper Receiver is compatible with?

Faxon Firearms ARAK-21 Complete Upper Receiver Orderable Models

List of Orderable Models

Faxon Firearms ARAK-21 Complete Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models