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However, the M4A1 Carbine the M27 in bolt life, with an average of 9,000 rounds before lug shear.
For the Marine Corps, the ability to make accurate hits from any position – whether shot slung, from a barricade, off a bipod or pack, etc – without substantial POI shift thanks to a free-floated barrel unit is value-added for each rifleman.
Together, these features mean, simply: The M27 is more accurate, stays accurate longer, and has a longer barrel life than either the M4 Carbine or the M16A4 Rifle.
In the M4, this steel is button rifled, heat treated to between 277 and 331 Brinell (approximately 28-36 Rockwell C) and then chrome-lined.
With the M27, in contrast, the barrel is made of high chromium content Aubert & Duval chrome-molybdenum-vanadium steel, cold hammer forged to give a tapered bore, and heat treated to 41 Rockwell C, then chrome lined.
To start, versus the M4 Carbine and M16A4 Rifle, the M27 IAR has a superior barrel and handguard system.