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Faxon Firearms ARAK-21 Complete Upper Receiver Includes Blazin' Deal w/ Free Shipping — 3 models

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 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
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
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, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
OpticsPlanet Exclusive Faxon Firearms Complete Upper Receiver, ARAK-21, 16in, 5.56, MuzzLok, Sand, URSSB556-OP-SND
1 of 29 images
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 7.62x39, URSSB762P
2 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
3 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
4 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
5 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
6 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
7 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
8 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
9 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
10 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
11 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
12 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
13 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
14 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
15 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
16 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
17 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in 7.62x39, URSSB762P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
18 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
19 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
20 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
21 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
22 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
23 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
24 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
25 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
26 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
27 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
28 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P
29 of 29 images
Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P

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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
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...
Read More...
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...
Read More...
4/4 found this helpful
Helpful Positive Review
Range fire by MSG RET, 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...
Read More...
1/1 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...
10/10 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...
2/4 found this helpful
Helpful Positive Review
Faxon Quality by MSG RET, 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...
Read More...
1/2 found this helpful
Read All 8 Reviews

Faxon Deals: Barrels, Compensators & More!

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Blazin' Deal
Prices have been cut drastically on select models of this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts - sorry about that. This offer won't last long, so don't miss out!
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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.image

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
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

Faxon Firearms ARAK-21 Complete Upper Receiver Orderable Models

List of Orderable Models

  • DEMO, Faxon Firearms ARAK-21 Complete Upper Receiver, 12.5in, 5.56, URSSB556P , MPN: URSSB556P-DEMO , Code: 11I-URC-SDF2-URSSB556P-DEMO-OB-A
  • 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, 12.5in, 5.56, URSSB556P , MPN: URSSB556P , UPC: 816341025608 , Code: 11I-URC-SDF2-URSSB556P

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
  • 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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