Skip to content
Diamond K ArmoryDiamond K Armory
  • Shop
    • In Store
    • Online Only
  • Monthly Auctions
  • Info
    • About
    • Transfers
    • Consignments
    • FAQ’s
    • Past Auctions
  • NFA Update
  • Login / Register
  • Cart / $0.00 0
    • No products in the cart.

      Return to shop

  • 0
    Cart

    No products in the cart.

    Return to shop

  • Click here for the november auction | closes 11/14
  • Click here for the november auction | closes 11/14
Home / Product Action / .223 REM/5.56 NATO
Filter

Showing 1–50 of 63 results

Filters
  

Product categories

Aim Sports AR5CUB8 Assembly  5.56x45mm NATO 10.50" Black Nitride Barrel 7075-T6 Aluminum Black Anodized Receiver 10" M-LOK Handguard for AR-15
Add to wishlist
Quick View
Out of stock

Aim Sports AR5CUB8 Assembly 5.56x45mm NATO 10.50″ Black Nitride Barrel 7075-T6 Aluminum Black Anodized Receiver 10″ M-LOK Handguard for AR-15

$359.99
Read more
ARAK-21 5.56 NATO COMPLETE UPPER RECEIVER 16'' MEDIUM BBL BLK
Add to wishlist
Quick View
Out of stock

ARAK-21 5.56 NATO COMPLETE UPPER RECEIVER 16” MEDIUM BBL BLK

$920.00
Read more
CMMG 55B8D86AB Dissent MK4 5.56x45mm NATO 10.50", Left Side Charging Handle, Armor Black, Zeroed Blast Comp, 9.60" M-LOK Handguard, Picatinny End Plate, Fits AR-Platform *UPPER ONLY
Add to wishlist
Quick View
Out of stock

CMMG 55B8D86AB Dissent MK4 5.56x45mm NATO 10.50″, Left Side Charging Handle, Armor Black, Zeroed Blast Comp, 9.60″ M-LOK Handguard, Picatinny End Plate, Fits AR-Platform *UPPER ONLY

$1,186.00
Read more
CMMG UPPER GROUP RESOLUTE MK4 - 5.56X45 16.1" NO BCG/C HANDLE
Add to wishlist
Quick View

CMMG UPPER GROUP RESOLUTE MK4 – 5.56X45 16.1″ NO BCG/C HANDLE

$493.00
Add to cart
Cobalt Kinetics CKPROURG556137BLK CK-Pro Urg  5.56x45mm NATO 13.70" Black Cerakote Receiver
Add to wishlist
Quick View
Out of stock

Cobalt Kinetics CKPROURG556137BLK CK-Pro Urg 5.56x45mm NATO 13.70″ Black Cerakote Receiver

$1,204.35
Read more
Cobalt Kinetics CKPROURG556145BLK CK-Pro Urg  5.56x45mm NATO 14.50" Black Cerakote Receiver
Add to wishlist
Quick View

Cobalt Kinetics CKPROURG556145BLK CK-Pro Urg 5.56x45mm NATO 14.50″ Black Cerakote Receiver

$1,204.35
Add to cart
Cobalt Kinetics CKPROURG55616BBLK CK-Pro Urg  5.56x45mm NATO 16" Black Cerakote Receiver
Add to wishlist
Quick View

Cobalt Kinetics CKPROURG55616BBLK CK-Pro Urg 5.56x45mm NATO 16″ Black Cerakote Receiver

$1,204.35
Add to cart
DD MK18 URG UPPER 556 10.3" MK18 FDE
Add to wishlist
Quick View
Out of stock

DD MK18 URG UPPER 556 10.3″ MK18 FDE

$1,527.00
Read more
Dpms Panther Arms DP51655155946 Kitty Kat  5.56 NATO 7.50" Black Nitride Barrel Aluminum Hard Anodized Black Receiver
Add to wishlist
Quick View

Dpms Panther Arms DP51655155946 Kitty Kat 5.56 NATO 7.50″ Black Nitride Barrel Aluminum Hard Anodized Black Receiver

$549.00
Add to cart
Dpms Panther Arms DP51655207090 Kitty Kat  5.56 NATO 7.50" Black Nitride Barrel Aluminum DPMS 6.5" Quad Rail Handguard
Add to wishlist
Quick View
Out of stock

Dpms Panther Arms DP51655207090 Kitty Kat 5.56 NATO 7.50″ Black Nitride Barrel Aluminum DPMS 6.5″ Quad Rail Handguard

$455.00
Read more
FAXON ARAK-21 COMPLETE UPPER - RECEIVER 5.56 12.5" BARREL
Add to wishlist
Quick View
Out of stock

FAXON ARAK-21 COMPLETE UPPER – RECEIVER 5.56 12.5″ BARREL

$920.00
Read more
FAXON ION ULTRALIGHT COMPLETE - UPPER RECEIVER 5.56 16"
Add to wishlist
Quick View

FAXON ION ULTRALIGHT COMPLETE – UPPER RECEIVER 5.56 16″

$1,011.00
Add to cart
FIGHT MCR DUAL FD UPR 556 MLOK 16.25
Add to wishlist
Quick View

FIGHT MCR DUAL FD UPR 556 MLOK 16.25

$5,899.99
Add to cart
FIGHT MCR MIL DF UPR 556 MLOK 16.25"
Add to wishlist
Quick View

FIGHT MCR MIL DF UPR 556 MLOK 16.25″

$6,599.99
Add to cart
FIGHT MCR MIL DF UPR 556 PIC 16.25"
Add to wishlist
Quick View

FIGHT MCR MIL DF UPR 556 PIC 16.25″

$6,599.99
Add to cart
Fightlite Industries MCR556DFRS   5.56x45mm NATO 12.50" 7075-T6 Aluminum MIL-STD 1913 Rail Handguard
Add to wishlist
Quick View

Fightlite Industries MCR556DFRS 5.56x45mm NATO 12.50″ 7075-T6 Aluminum MIL-STD 1913 Rail Handguard

$6,599.99
Add to cart
GE URG-I NC 556NATO 10.3" BLK/DDC
Add to wishlist
Quick View
Out of stock

GE URG-I NC 556NATO 10.3″ BLK/DDC

$1,525.00
Read more
GEISSELE 08-159 URG-I NEAR CLONE 556 14.5 BK/DDC
Add to wishlist
Quick View

GEISSELE 08-159 URG-I NEAR CLONE 556 14.5 BK/DDC

$1,525.00
Add to cart
GEMTECH GVAC UPPER GROUP 5.56MM 16.1"
Add to wishlist
Quick View

GEMTECH GVAC UPPER GROUP 5.56MM 16.1″

$756.00
Add to cart
HECKLER AND KOCH (HK USA) MR556A4 UPPER KIT 5.56MM 11"
Add to wishlist
Quick View
Out of stock

HECKLER AND KOCH (HK USA) MR556A4 UPPER KIT 5.56MM 11″

$2,179.00
Read more
HK 51000384 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4
Add to wishlist
Quick View
Out of stock

HK 51000384 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4

$2,179.00
Read more
HM Defense 16MBUP556 MonoBloc Upper  223 Rem, 5.56x45mm NATO 16" Black Cerakote Barrel, 7075-T6 Aluminum Black Anodized Receiver, 15" M-LOK Free-Float Handguard for AR-15
Add to wishlist
Quick View

HM Defense 16MBUP556 MonoBloc Upper 223 Rem, 5.56x45mm NATO 16″ Black Cerakote Barrel, 7075-T6 Aluminum Black Anodized Receiver, 15″ M-LOK Free-Float Handguard for AR-15

$650.00
Add to cart
LBE Unlimited AR125RBK Ready Build Kit  12.5"
Add to wishlist
Quick View

LBE Unlimited AR125RBK Ready Build Kit 12.5″

$523.00
Add to cart
LBE Unlimited AR137RBK Ready Build Kit  13.7"
Add to wishlist
Quick View

LBE Unlimited AR137RBK Ready Build Kit 13.7″

$523.00
Add to cart
LBE Unlimited AR145RBK Ready Build Kit  14.5"
Add to wishlist
Quick View

LBE Unlimited AR145RBK Ready Build Kit 14.5″

$523.00
Add to cart
LBE Unlimited AR75RBK Ready Build Kit  7.5"
Add to wishlist
Quick View

LBE Unlimited AR75RBK Ready Build Kit 7.5″

$452.00
Add to cart
LBE Unlimited ARUPPER Upper Receiver  5.56x45mm NATO 7075-T6 Aluminum Black Receiver for AR-15 Includes Forward Assist
Add to wishlist
Quick View
Out of stock

LBE Unlimited ARUPPER Upper Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Receiver for AR-15 Includes Forward Assist

$116.00
Read more
LUTH AR A2 ASSEMBLED UPPR RECVR N/CH
Add to wishlist
Quick View
Out of stock

LUTH AR A2 ASSEMBLED UPPR RECVR N/CH

$206.75
Read more
LUTH AR STRIPPED A2 UPPER BLACK
Add to wishlist
Quick View

LUTH AR STRIPPED A2 UPPER BLACK

$108.05
Add to cart
Luth-ar UR-01-E3-M4 A1 Stripped Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver
Add to wishlist
Quick View
Out of stock

Luth-ar UR-01-E3-M4 A1 Stripped Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver

$150.35
Read more
Luth-ar UR-01-E3-S A1 Stripped Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver
Add to wishlist
Quick View
Out of stock

Luth-ar UR-01-E3-S A1 Stripped Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver

$161.63
Read more
Luth-ar UR-01-M16-A A1 Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver for M16
Add to wishlist
Quick View

Luth-ar UR-01-M16-A A1 Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver for M16

$206.75
Add to cart
Luth-ar UR-01A A1 Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver
Add to wishlist
Quick View
Out of stock

Luth-ar UR-01A A1 Upper Receiver 223/5.56mm Aluminum Black Hardcoat Anodize Receiver

$193.59
Read more
M16 A1 5.56 NATO STRIPPED UPPER RECEIVER BLACK
Add to wishlist
Quick View

M16 A1 5.56 NATO STRIPPED UPPER RECEIVER BLACK

$150.35
Add to cart
M4E1 ENHANCED 5.56MM ASSEMBLED UPPER RECEIVER FOR AR-15 BLK
Add to wishlist
Quick View
Out of stock

M4E1 ENHANCED 5.56MM ASSEMBLED UPPER RECEIVER FOR AR-15 BLK

$199.99
Read more
MCR BELT-FED UPPER RECEIVER AUTO 16.25'' 1913
Add to wishlist
Quick View

MCR BELT-FED UPPER RECEIVER AUTO 16.25” 1913

$5,899.99
Add to cart
Patriot Ordnance Factory  Minuteman Complete Upper 5.56x45mm NATO 10.50" Black Nitride Barrel Aluminum Black Anodized Receiver 9" M-LOK Handguard Lo Pro DI Gas Block (Mid Length)
Add to wishlist
Quick View

Patriot Ordnance Factory Minuteman Complete Upper 5.56x45mm NATO 10.50″ Black Nitride Barrel Aluminum Black Anodized Receiver 9″ M-LOK Handguard Lo Pro DI Gas Block (Mid Length)

$1,040.00
Add to cart
Patriot Ordnance Factory  Minuteman Complete Upper 5.56x45mm NATO 10.50" Black Nitride Barrel Aluminum Patriot Brown Receiver 9" M-LOK Handguard Lo Pro DI Gas Block (Mid Length)
Add to wishlist
Quick View
Out of stock

Patriot Ordnance Factory Minuteman Complete Upper 5.56x45mm NATO 10.50″ Black Nitride Barrel Aluminum Patriot Brown Receiver 9″ M-LOK Handguard Lo Pro DI Gas Block (Mid Length)

$904.00
Read more
Patriot Ordnance Factory  Minuteman Complete Upper 5.56x45mm NATO 16.50" Black Nitride Barrel Aluminum Black Anodized Receiver 14.50" M-LOK Handguard Lo Pro DI Gas Block (Mid Length)
Add to wishlist
Quick View

Patriot Ordnance Factory Minuteman Complete Upper 5.56x45mm NATO 16.50″ Black Nitride Barrel Aluminum Black Anodized Receiver 14.50″ M-LOK Handguard Lo Pro DI Gas Block (Mid Length)

$1,040.00
Add to cart
Patriot Ordnance Factory  Minuteman Complete Upper 5.56x45mm NATO 16.50" Black Nitride Barrel Aluminum Patriot Brown Receiver 14.50" M-LOK Handguard Lo Pro DI Gas Block (Mid Length)
Add to wishlist
Quick View

Patriot Ordnance Factory Minuteman Complete Upper 5.56x45mm NATO 16.50″ Black Nitride Barrel Aluminum Patriot Brown Receiver 14.50″ M-LOK Handguard Lo Pro DI Gas Block (Mid Length)

$904.00
Add to cart
Patriot Ordnance Factory  Renegade + Complete Upper 5.56x45mm NATO 10.50" Black Nitride Barrel Aluminum Black Anodized Receiver 9" M-LOK Handguard Adjustable Block
Add to wishlist
Quick View
Out of stock

Patriot Ordnance Factory Renegade + Complete Upper 5.56x45mm NATO 10.50″ Black Nitride Barrel Aluminum Black Anodized Receiver 9″ M-LOK Handguard Adjustable Block

$960.00
Read more
Patriot Ordnance Factory  Renegade + Complete Upper 5.56x45mm NATO 10.50" Black Nitride Barrel Aluminum Black Anodized Receiver 9" M-LOK Handguard Adjustable Block
Add to wishlist
Quick View

Patriot Ordnance Factory Renegade + Complete Upper 5.56x45mm NATO 10.50″ Black Nitride Barrel Aluminum Black Anodized Receiver 9″ M-LOK Handguard Adjustable Block

$960.00
Add to cart
POF USA P-415 EDGE UPPER 5.56 10.5" BK
Add to wishlist
Quick View

POF USA P-415 EDGE UPPER 5.56 10.5″ BK

$1,213.00
Add to cart
POF USA P-415 EDGE UPPER 5.56 16.5" BK
Add to wishlist
Quick View

POF USA P-415 EDGE UPPER 5.56 16.5″ BK

$1,116.00
Add to cart
RRA CMPTL RRAGE 3G UPR 5.56NATO 16"
Add to wishlist
Quick View

RRA CMPTL RRAGE 3G UPR 5.56NATO 16″

$504.00
Add to cart
SLICK SIDE A1 5.56 NATO ASSEMBLED UPPER RECIEVER BLACK
Add to wishlist
Quick View

SLICK SIDE A1 5.56 NATO ASSEMBLED UPPER RECIEVER BLACK

$203.93
Add to cart
SPIKE'S 556NATO M4 LE UPPER W/RAIL
Add to wishlist
Quick View

SPIKE’S 556NATO M4 LE UPPER W/RAIL

$743.40
Add to cart
Spikes STU5025M4S Complete Upper  5.56x45mm NATO 16" Black Phosphate Barrel, 7075-T6 Aluminum Black Receiver, M4 Double Head Shield Handguard for M4 Carbine
Add to wishlist
Quick View
Out of stock

Spikes STU5025M4S Complete Upper 5.56x45mm NATO 16″ Black Phosphate Barrel, 7075-T6 Aluminum Black Receiver, M4 Double Head Shield Handguard for M4 Carbine

$835.00
Read more
Spikes STU5435MLS Complete Upper  5.56x45mm NATO 16" Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12" SAR3 Free-Floating Handguard for AR-15
Add to wishlist
Quick View
Out of stock

Spikes STU5435MLS Complete Upper 5.56x45mm NATO 16″ Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12″ SAR3 Free-Floating Handguard for AR-15

$630.00
Read more
Spikes STU5435R2S Complete Upper  5.56x45mm NATO 16" Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12" SAR3 Free-Floating Handguard for AR-15
Add to wishlist
Quick View
Out of stock

Spikes STU5435R2S Complete Upper 5.56x45mm NATO 16″ Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12″ SAR3 Free-Floating Handguard for AR-15

$788.40
Read more
  • 1
  • 2
Hours & Info
535 HCR 4223
Hillsboro, Texas 76645
(254) 870-8990
[email protected]
M - F: 9:00 AM - 6:00 PM
Saturday: By Appointment Only
Terms & Conditions

Privacy Policy

Terms & Conditions

Shipping & Returns Policy

Delivery Timeframe

FAQ’s

Visa
PayPal
Stripe
MasterCard
Bank Transfer
Cash on Pickup
Copyright 2026 © 2026 Diamond K Armory. All Rights Reserved.
  • Shop
    • In Store
    • Online Only
  • Monthly Auctions
  • Info
    • About
    • Transfers
    • Consignments
    • FAQ’s
    • Past Auctions
  • NFA Update
  • Login / Register
Login with Google

Login

Lost your password?

Register

A link to set a new password will be sent to your email address.

Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy.

Loading Comments...