Armscor 223REM 55GR FMJ 20

Product Description

Armscor 223REM 55GR FMJ 20 is .223 Remington centerfire ammunition loaded with 55-grain full metal jacket bullets and packaged in 20-round boxes. This is training and range ammunition built around a ball-type FMJ projectile.

Full metal jacket bullets feed reliably and leave barrels cleaner than exposed-lead designs. The 55-grain bullet weight is the original military specification for the .223 Remington and 5.56 NATO cartridges.

This ammunition suits AR-15 pattern rifles, bolt-action .223 rifles, and any firearm chambered for .223 Remington. It works well for high-volume practice, function testing, and zeroing optics.

Key Facts

• Caliber: .223 Rem
• Bullet Type: FMJ (Full Metal Jacket)
• Grain Weight: 55 Grain
• Rounds per Box: 20

What 55gr FMJ Loads Are Built For

The 55-grain FMJ bullet is a ball round. It offers adequate accuracy for most training tasks out to 200 yards and feeds smoothly through semi-automatic actions. FMJ construction means the lead core is enclosed in a copper jacket, which reduces fouling compared to exposed-lead bullets.

This bullet weight stabilizes well in barrels with a 1:9 or faster twist rate, which includes most factory AR-15 barrels. If your rifle has a slower twist rate or you plan to shoot beyond 300 yards, confirm compatibility before ordering bulk quantities.

Armscor 55gr Ammunition Compared to Other Brands

Armscor produces brass-cased centerfire ammunition at a lower price point than many domestic brands while maintaining consistent performance for range work. Shooters often choose this brand when buying ammunition in volume for training rather than duty or competition use.

The 20-round box count is less common than 50-round or bulk packs. It suits shooters who want to test a brand before committing to larger quantities or who prefer smaller purchases for occasional range trips.

.223 Rem vs 5.56 NATO Chamber Compatibility

.223 Remington ammunition fires safely in rifles marked .223 Rem and in rifles marked 5.56 NATO or .223 Wylde. The .223 Remington cartridge operates at lower chamber pressure than 5.56 NATO, so it is the universal choice when chambering is uncertain.

Check your barrel or receiver markings if you are unsure of your rifle’s chambering. Most AR-15 rifles sold in the civilian market are chambered in 5.56 NATO or .223 Wylde and accept both cartridge types without issue.

Buying from Western Sport in Roanoke, TX

Western Sport is a licensed FFL/SOT dealer serving North Texas and the DFW area since 2007. We offer gunsmithing services on site and handle transfers for firearms and ammunition orders. Call 817-393-4000 to confirm current specifications or place an order.

Frequently Asked Questions

Q: Is Armscor 55gr FMJ ammunition accurate enough for zeroing a rifle scope?

A: Yes, 55-grain FMJ ammunition delivers sufficient accuracy to zero optics and confirm point of impact at typical range distances. Once you have a zero established with this ammunition, you can switch to match or hunting loads and make small adjustments as needed based on their different trajectories.

Q: Can I use .223 Rem ammunition in a 5.56 NATO chambered rifle?

A: Yes, .223 Remington ammunition fires safely in any rifle chambered for 5.56 NATO or .223 Wylde. The .223 Rem cartridge operates at lower pressure than 5.56 NATO, so it is fully compatible with the higher-pressure chamber. The reverse is not always true—confirm your chamber marking before firing 5.56 NATO in a rifle marked .223 Rem only.

Q: What is the difference between 55gr and heavier bullet weights in .223 Remington?

A: The 55-grain bullet is lighter and faster than 62-grain, 69-grain, or 77-grain projectiles. Lighter bullets lose velocity and energy more quickly at distance but perform well inside 300 yards. Heavier bullets stabilize better in faster-twist barrels and retain energy farther downrange, making them a better choice for precision shooting or longer distances.

Q: Will this Armscor ammunition cycle reliably in an AR-15?

A: Full metal jacket ammunition in 55 grains is the standard training load for AR-15 rifles and typically cycles reliably in any rifle with a properly gassed system and a carbine or rifle-length buffer. If you experience failures to eject or short-stroking, check your gas block alignment and buffer spring before switching ammunition brands.

Q: How does FMJ ammunition compare to soft point or hollow point for target shooting?

A: FMJ bullets are less expensive and leave less fouling in the barrel than soft point or hollow point designs. They are not legal for hunting in most jurisdictions because they do not expand on impact, but they are ideal for high-volume practice and training. Soft point and hollow point bullets are designed for hunting and defensive use, not range work.

Q: How do I order ammunition from Western Sport?

A: Call 817-393-4000 to place an order or visit our shop in Roanoke, Texas. We are a licensed FFL dealer and can walk you through the purchase process, answer questions about compatibility, and provide guidance on ammunition selection for your specific firearm and intended use.

Additional information