FN 5.56 Ammo for Sale
Updated · 285 products · 138 in stock · prices refreshed daily
(20)
Winchester 5.56mm 55gr FMJ Ammunition 20-Rounds
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$9.99
33
(20)
PMC X-Tac 5.56mm NATO 62gr LAP Ammunition 20rds - 556k
Brand:
PMC
Bullet Type:
LAP
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
62 grain
From:
$9.69
30
(16)
Hornady Frontier 5.56 NATO Ammo 55 Grain FMJ, 20rds - FR200
Brand:
Hornady
Bullet Type:
FMJ
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$8.99
32
(0)
Winchester USA White Box Target Ammo
Brand:
Winchester
Bullet Type:
Full Metal Jacket Lead Core
Caliber:
7.62x51mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
149 grain
From:
$17.99
33
(20)
Winchester 5.56 M855 Green Tip Brass 62-Grain 20-Rounds FMJ
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
62 grain
From:
$10.49
33
(20)
PMC X-TAC 5.56 NATO Ammo 55 Grain FMJBT, 20 rds/box - 556X
Brand:
PMC
Barrel Length:
20"
Bullet Type:
Full Metal Jacket Boat Tail
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
From:
$9.26
30
(0)
Winchester Ammo 5.56x45mm NATO M193 Ammo 55 G rain FMJ 150 Rounds Value Pack
Brand:
CCI
Bullet Type:
FULL METAL JACKET (FMJ)
Caliber:
5.56×45mm NATO
Capacity:
150
Finish Per Color:
Brass
Grains:
55 grain
From:
$77.99
29
(9)
PMC X-Tac 7.62x51mm 147gr FMJ Ammunition, 20 Round Box - 7.62X
Brand:
PMC
Bullet Type:
Full Metal Jacket Boat Tail
Caliber:
7.62x51mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
147 grain
From:
$18.22
28
(9)
Hornady Frontier 5.56 Nato 68gr BTHP Match 20 Rounds - FR310
Brand:
Hornady
Bullet Type:
BTHP
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
68 grain
From:
$12.49
30
(0)
5.56x45 - 75 Grain Interlock HD SBR - Hornady BLACK - 20 Rounds
Brand:
Hornady
Bullet Type:
InterLock HD
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
75 grain
From:
$23.79
28
(7)
Winchester M855 5.56 Ammo 62 Grain FMJ 500 Rds - WM855500
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
500
Finish Per Color:
Brass
Grains:
62 grain
(0)
Fiocchi Shooting Dynamics 5.56x45 55 gr FMJBT 50 Rounds Ammunition - 556M193L
Brand:
Fiocchi
Bullet Type:
Full Metal Jacket Boat Tail
Caliber:
5.56×45mm NATO
Capacity:
50
Finish Per Color:
Brass
Grains:
55 grain
From:
$27.11
25
(0)
Hornady AMMO 5.56 NATO 75 GR BTHP SPF
Brand:
Hornady
Bullet Type:
BTHP
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
75 grain
From:
$24.69
27
(1)
PMC Battle Pack 5.56mm 62gr, Light Armor Piercing, 120rd Box
Brand:
PMC
Barrel Length:
20"
Bullet Type:
Light Armor Piercing
Caliber:
5.56×45mm NATO
Capacity:
5
Finish Per Color:
Blued / Hardwood
From:
$68.08
25
(4)
Hornady Frontier 62 gr Full Metal Jacket 5.56 Ammo, 20/box - FR260
Brand:
Hornady
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
62 grain
From:
$10.72
25
(0)
Frontier Cartridge, Lake City, 556 NATO, 55 Grain, Hollow Point Match, 20 Round Box
Brand:
Frontier Cartridge
Bullet Type:
HOLLOW POINT MATCH
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$10.99
24
(0)
Barnes Bullets Precision 69 gr Open Tip Match Boat Tail 5.56 Ammo, 20/box - 30846
Brand:
Barnes
Bullet Type:
OTM BOAT TAIL
Caliber:
5.56×45mm NATO
Grains:
69 grain
Rounds:
20
From:
$31.29
22
(7)
Winchester Ammunition 55 gr Full Metal Jacket 5.56 Ammo, 1000/box - WM1931000
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
1000
Finish Per Color:
Brass
Grains:
55 grain
(0)
Fort Scott Munitions Tui, Fsm 556-055-scv 556nato 55gr Scs Tui 20/25
Brand:
Fort Scott Munitions
Bullet Type:
Solid Copper Spun
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$23.49
22
(0)
Winchester USA 7.62 Nato 147g FMJ Ammunition 20rds - Q3130
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
7.62x51mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
147 grain
From:
$15.99
21
(20)
Winchester M855 62 gr Green Tip FMJ 5.56x45mm Ammunition 150 Rounds - WM855150
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
150
Finish Per Color:
Brass
Grains:
62 grain
From:
$78.79
26
(2)
PPU Rangemaster 145 gr FMJBT 7.62x51 Ammunition 20 Rounds - PPRM762
Brand:
Prvi Partizan
Bullet Type:
FMJBT
Caliber:
7.62x51mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
145 grain
From:
$18.99
23
(4)
Hornady Frontier 55 gr Full Metal Jacket 5.56 Ammo, 150/box - FR2015
Brand:
Hornady
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Grains:
55 grain
Rounds:
150
From:
$69.99
24
(1)
Winchester USA Valor M193 55 gr FMJ 5.56 Ammunition, 125 Rounds - USA193125
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
125
Finish Per Color:
Brass
Grains:
55 grain
From:
$62.99
21
Marketplace Insights
★ 4.6/5
based on 1,951 customer reviews across 285 products from 45 retailers
Highly reliable firearms and ammunition with excellent value; minor complaints about hand rail designs and out-of-box trigger quality.
What customers like
Reliability & Performance42%
Haven't experience any failures so far.
Excellent Value for Price35%
Best bang for your bucks.
Accuracy & Shooting Quality28%
shooting tight groups at 25 yds
Fast Shipping & Service18%
Super fast processing and shipping.
Quality Craftsmanship15%
quality and craftsmanship are top notch
Common concerns
Hand Rail Design Issues8%
Dont like the hand rail. Needs mlok or picatiny on top.
Heavy Trigger Pull4%
the trigger is near 12 lbs. of pull
Out of Box Issues4%
Did not function out of the box.
Ammo Packaging Problems3%
Foicchi needs to work on putting correct # of rounds in a box
Frequently Asked Questions
FN 5.56 Ammo for Sale
Is 5.56x45mm NATO the same as 223?
Not quite. Both cartridges are identical externally, but 5.56 NATO runs at higher pressure (around 58,000 psi) than .223 Remington. A rifle chambered for 5.56 NATO safely fires .223, but a .223-only rifle shouldn't shoot 5.56 NATO due to chamber differences and pressure levels.
Can I shoot 5.56 in a .223 rifle?
No, not safely. 5.56 NATO operates at higher pressures than .223 Remington chambers are designed for, risking dangerous overpressure. The reverse is fine—5.56 chambers safely handle .223 ammo.
Is it better to buy 5.56 or 223?
Neither is objectively better—it depends on your rifle's chamber. If your rifle is marked 5.56 NATO, shoot either cartridge. If it's .223 Remington only, use .223 ammo. 5.56 NATO runs at higher pressure, while .223 Remington is slightly faster. Both are widely available and affordable.
What is the shelf life of 5.56 ammo?
Properly stored 5.56 ammo remains functional for decades. Manufacturers conservatively recommend using rounds within ten years, but longevity depends heavily on storage conditions. Keep ammunition cool, dry, and away from moisture and temperature swings. Poor storage degrades rounds within a few years, while ideal conditions can preserve them indefinitely.
How do I know if my AR can shoot 5.56 and 223?
Check your barrel marking between the front sight base and muzzle. If it says "5.56 NATO" or ".223 Wylde," you can shoot both safely. A ".223 Remington only" marking means .223 ammo only—5.56 NATO runs higher pressure and risks damage.
Can you put 556 and 223 in the same clip?
Yes, you can load both .223 Remington and 5.56 NATO rounds in the same magazine. Only fire them from a rifle chambered for both. A 5.56 NATO chamber safely shoots either cartridge, but a .223-only chamber risks dangerous overpressure with 5.56 ammo.
What's better, 55gr or 62gr?
Choice depends on your goals. The 55-grain is lighter and faster with a flatter trajectory. The 62-grain hits harder with slightly more drop at distance but is considered the better all-around option. Most modern AR-15s handle both weights fine — pick based on intended use, not twist rate.
What grain 5.56 does the army shoot?
The U.S. Army primarily uses M855 62-grain 5.56 NATO ammunition as its standard-issue round. The newer M855A1 Enhanced Performance Round is also 62 grains. 55-grain M193 rounds are used in some training contexts.
