M855A1 EPR Combat Ammunition


M855A1 EPR Combat Ammunition $219.99$1,264.99

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M855A1: It would take a massive improvement in ballistics to ever convince the American military to swap from the 5.56. Plenty of intermediate rounds offer advantages over the standard 5.56 round, but the advantages aren’t significant enough to warrant the logistical nightmare that is a caliber swap. However, changing up the 5.56 isn’t that difficult and can be done relatively easily with minimal disruption in logistics. It happened before when the Army moved from M193 to M855, and now to M855A1.

The M855A1 has been the subject of plenty of gnashing of teeth and is both loathed and loved. Today we are going to take an unbiased look at the M855A1 and discuss why the Army and Marine Corps moved to the new round and explore its benefits as well as its downsides.


The M885A1 utilizes a 62-grain projectile, much like the M855. It is slightly longer than the M855 due to its construction. The Army completely eliminated lead from the equation. The use of a copper jacket combined with a copper plug maintained the weight of the M855A1 round and offered better penetration.

Comparison of M193, M855, M855A1, and M855A1 copper core rounds

Additionally, the round’s elimination of lead allows the projectile to be green-friendly and doesn’t pollute the Army’s training areas. The copper cup sits at the bottom of the round; it is a reverse-drawn copper alloy jacket, which is the opposite of the M855. The steel slug is heavier and exposed versus the copper jacket that encloses the steel slug on the M855 round.

Beyond the projectile, the M855A1 is optimized for the shorter barrel of the M4. The M855 was optimized for the longer-barreled M16 series rifle. The M855A1 uses a faster burning powder that creates more pressure and amps up velocity. This higher velocity results in more effective penetration and down-range performance.


Armor-piercing is a loaded term that’s tough to define without defining the armor. The Army and military, in general, have a set definition of armor-piercing. According to the military’s definition, the M855A1 is not an armor-piercing round. Instead, the famed blacktip M993 is the Army’s 5.56 caliber armor-piercing round. The M855A1 will pierce through soft armor and subpar armor plates but doesn’t zip through modern armor.

The M855A1 uses a steel penetrator that does well against hard barriers and even mild steel plates. In fact, it performs substantially better than the original M855 when it comes to barrier penetration. With that said, it’s still not considered armor-piercing.


The M855A1 does a fantastic job of piercing through hard barriers. When it zips through wood, glass, car steel, and similar mediums, the projectile maintains great ballistic potential. It can pierce a ⅜ inch mild steel plate out to 160 yards. Beyond that, the round yaws like the standard M855, and when yawing, the round increases its terminal effectiveness.

The difference in yawing translates to more consistent performance regardless of the angle. When the standard M855 approaches via a high angle of yaw, the performance is brilliant and effective. When the M855 strikes at a low angle of yaw, the round performs inconsistently. However, the M855A1 performs regardless of the angle of yaw.

As such, the M855A1 isn’t yaw-dependent. It even outperforms the 7.62 M80 round in that regard: The 7.62 might be bigger and heavier, but the M80 is yaw-dependent, much like the M855.

The M855A1 doesn’t offer more range than the M855 but is more effective at longer ranges. Both the M855 and M855A1 rounds maintain the same trajectory, but along that trajectory, the M855A1 performs with great efficiency along that trajectory.

All this, without any weight increase to the individual soldier.


Not even advanced ammo design gives us a free lunch and the M855A1 does have some downsides. First, to obtain M16 performance in an M4, the manufacturer had to use a faster burning powder that accelerates the velocity of the round. In doing so, pressure increases. The M855 has an average PSI of 51,500. The M855A1 increases that pressure to over 61,000 PSI. This results in increased wear on firearms, including on their the bolt and barrel.

The exposed steel penetrator and harder nature of the round were also shown to wear down the barrel extensions of M4 rifles. The round didn’t fully clear the ramps of the M4 and would be driven into the feed ramps. To remedy this, a new magazine design was implemented that ensured the round sat higher in the magazine and fed into the weapon without damaging the barrel extension.


The benefits of the M855Aq are apparent. In the short term, the round will make the Soldier and Marine more lethal and better able to kill their enemies.

The long-term issues of durability are a major concern, however as Soldiers and Marines can’t afford a broken bolt in the middle of a firefight.

For the M855A1 to function long-term, the military will need to ensure both the M27 and M4 rifles can withstand the abuse the round throws at them.

FAQ On Green Ammo

What are the benefits of green tip ammo?

Green Tip Ammo - What is It, What's It Used For?

Being able to punch through a barrier without needing a larger cartridge does have its advantages. Green-tipped ammo is a quality round that fires reliably and will not cause excess carbon build-up in your rifle like poorly made ammo.

Does green tip ammo penetrate body armor?

Will Green Tip ammo penetrate Body Armor?

The M855 green tip features a steel tip over a tungsten-composite or lead core, encased in a full copper jacket. While it is true that this round can penetrate a steel helmet at 800 yards, it is essential to clarify that it is not classified as an armor-piercing round by the ATF.

Does green tip ammo really work?

Green tip 5.56mm can pierce some armor, but it isn’t made for that purpose. Yes, part of the original development cycle was piercing very light armor, but that alone does not armor-piercing ammunition make.

What’s the difference between green tip and FMJ?

What is the difference between regular FMJ 5.56 ammo and ...

The difference between regular FMJ 5.56 ammo and green tip ammo is that the latter has a steel core, which makes it more penetrative and able to pierce through some armor. Some gun ranges may not allow green-tip ammo because it can cause more damage to their backstops and targets. M855a1 enhanced performance works with m4 carbine, m16a2 rifle, 5.56 mm ball and are environmentally friendly.

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