XM193 is the commercial version of the M193 ball round that set the standard for 5.56 NATO, and it remains the go-to load for AR-15 training. This listing is Federal American Eagle 5.56x45mm 55 grain full metal jacket boat tail ammo, MPN XM193BK150, sold as 600 rounds. Each 150 round bulk pack fills five 30 round magazines with nothing left over.
Federal lists this load at 3,240 fps with 1,282 ft-lbs of muzzle energy. The 55 grain boat tail bullet has a lead core, so it is not magnetic and is accepted at many ranges that ban steel core ammunition. It shoots flat out to typical carbine distances and runs reliably in direct impingement and piston AR-15s. As an FMJ, it is intended for training, steel, and plinking, not hunting, and it should not be your choice for home defense when bonded and expanding options exist.
This ammunition fits rifles chambered in 5.56x45mm NATO, including Colt, Daniel Defense, BCM, Aero, Ruger AR-556, and Smith and Wesson M&P15 rifles, the FN SCAR 16, the IWI Tavor, the SIG MCX, and the Ruger Mini-14 in 5.56. A common question is whether 5.56 can be fired in a rifle marked 223 Rem. It is not recommended, because 5.56 runs at higher pressure than a 223 chamber is designed for. A 5.56 or 223 Wylde chamber handles both. Another common question is what twist rate suits 55 grain. Nearly any AR twist from 1 in 12 to 1 in 7 shoots it well.
Federal XM193BK150 is new production ammunition, not reloads, made in the USA. The cases are boxer-primed brass with non-corrosive priming, and they reload well. This listing ships as 4 bulk packs of 150 rounds for 600 rounds total from one lot. The 150 round pack size makes it easy to grab exactly what you need for a range session without breaking open a full case.
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