TacFire RK556 Unassembled AR-15 Complete Rifle Kit

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Aero Precision Gen 2 AR-15 Stripped Lower Receiver

Aero Precision X15 AR-15 Gen 2 Stripped Lower Receiver


Aero Precision Gen 2 AR-15 Stripped Lower Receiver

Aero Precision X15 AR-15 Gen 2 Stripped Lower Receiver

Mounted on 1/2 Inch Drive Torque Wrench

AT3™ Barrel Nut Wrench - Compatible with this kit!


Mounted on 1/2 Inch Drive Torque Wrench

AT3™ Barrel Nut Wrench for SPEAR M-LOK Handguards and Pro Quad Rails

Unassembled Rifle Kit with Free-Float Handguard

Build a complete AR-15 that can do it all at an excellent price point with Tacfire.  This kit ships to your door unassembled, with everything you need, less your choice in lower receiver to make a range-ready rifle.  With a reliable carbine-length gas system and a free-floated barrel, this kit will come together into a gun that’s ready to run.

Be sure to snag a barrel nut wrench for ultra-secure handguard installation!

The Do-Everything, High-Value Rifle Kit

Once assembled, the free-floating barrel  has great accuracy potential.  With a 1:8  twist rate, your new rifle will stabilize everything from 55 grain range ammo to 69 plus grain match projectiles.  And the free-floating handguard will keep your groups tighter than a standard M4 style upper.  With the milspec fire control group, you’ll get positive ignition with steel cased ammo, with a standard 5 to 6 pound trigger pull.

The bottom line on this kit?  It has everything you need for a reliable AR-15 build, with features you might pay out the nose for with an off-the-shelf rifle. With what you save in roll marks or brand names, pick up ammo, magazines, a red dot sight, or any other accessories you need.  Plus, it’s a perfect companion to an 80% receiver.


  • 16″ Parkerized Carbine Barrel with 1:8 Twist Rate
  • A2 Bird Cage Flash Hider
  • .750 Low Profile Steel Gas Block
  • Carbine Length Gas Tube
  • 15″ Slim M-LOK Free Float Hand Guard
  • Steel Barrel Nut and Handguard Hardware
  • 5.56 NATO Bolt Carrier Group
  • Forged Aluminum Upper Receiver with M4 Feed Ramps
  • Mil-Spec Charging Handle
  • Dust Cover Assembly
  • Forward Assist Assembly
  • Lower Parts Kit with Fire Control Group
  • A2 Pistol Grip
  • Mil-Spec 6-Position Stock
  • Mil-Spec Diameter Buffer Tube
  • 3 oz. Buffer
  • Buffer Spring
  • Receiver End Plate
  • Castle Nut

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

TacFire Inc. products are warranted and protected for a Limited Lifetime from manufacture defects in materials and workmanship. TacFire® will replace (at their discretion & subject to availability) the defective product(s) after their Returns Customer Service Center staff has tested & determined the item(s) returned are defective & not functioning properly. Any types of modifications will void the product(s) warranty. The product must be returned within your 90 days of ownership and you must provide a copy of your receipt to show the Proof of Purchase from an authorized dealer. After the 90 days of ownership you will be required to send us a $10 handling fee made payable to TacFire Inc® by check or money order with a valid proof of purchase. Please email for an RMA number before returning product(s) at support@tacfireinc.com.

90 Day Guarantee: If you purchased your product within 90 days, Tacfire will waive the $10.00 handling fee. All you have to include is a note/ letter with a copy of your proof of purchase.
*Warranty valid for USA customers only

Returns Shipping Center Address:
TacFire Inc.
Attention: RETURNS
3436 De Forest Cir.
Unit # 1
Mira Loma, CA 91752

Return Procedure:
1. Email the Tacfire Returns Shipping Center through returns@tacfireinc.com so that we can send you our warranty form to print out and we will provide you a Return Merchandise Authorization #. It is important that you contact Tacfire for an RMA to avoid any delays in processing time.
2.) Print out warranty form & fill in all the necessary fields making sure to write in the correct return address and don’t forget to include your RMA# along with a brief description of the issue you are experiencing with the product.
Note: TacFire Inc will not be held responsible for incorrect or undeliverable addresses given to us.
3. Along with the warranty form please enclose a copy of your receipt and a $10.00 check or money order payable to TacFire Inc. if it has been over 90 days of ownership, for the shipping and handling.
4. Pack everything in the original box and ship to the Tacfire Returns Shipping Center, making sure to write your RMA# also on the outside of your package.
Note: We are not responsible for any incoming lost packages, so make sure to save your tracking information for your own records.
*Average turnaround time is about 2 weeks for returns processing.