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Our source told TFB that with M855A1, the M27 achieved an average bolt life (measured to the first lug shearing off) in official high round count tests of 6,000-7,000 rounds, and a barrel life (measured to 200 ft/s velocity loss) of 9,000-10,000 rounds.In those same tests, the M4A1 achieved a barrel life of just 7,000 rounds due to its inferior steel and construction (though the carbines continued to group well for thousands more rounds).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.

Our source told TFB that with M855A1, the M27 achieved an average bolt life (measured to the first lug shearing off) in official high round count tests of 6,000-7,000 rounds, and a barrel life (measured to 200 ft/s velocity loss) of 9,000-10,000 rounds.In those same tests, the M4A1 achieved a barrel life of just 7,000 rounds due to its inferior steel and construction (though the carbines continued to group well for thousands more rounds).

The reason for the M27’s lackluster bolt life has to do with its gas system.

From its inception, the HK416 (the family to which the M27 belongs) was designed as a short-barreled rifle, an industry-driven effort to create an alternative to the early Mk.18 Close Quarters Battle Receiver.

As I will elaborate below, this disparity in bolt life is the result of something peculiar and inherent to the M27’s design, and it would therefore take considerable time, effort and money via extensive equipment change proposals (ECPs) to rectify the problem.

For the M4 Carbine, however, even better bolt life than current could be achieved via simple drop-in upgrades and improvements at very low cost.

A more sound approach would be to leverage the competitive environment to procure something better, lighter, and cheaper.

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One area where a new rifle might improve over the M27 is in the bolt and gas system configuration.

To achieve the reliability needed, Heckler & Koch dramatically increased the gas flow to the HK416’s short-stroke piston.

This improved reliability with the 10.5″ barrels and H&K “Navy” steel magazines of the original requirement.

Tags: ***, 5.56mm, carbine, future, h and k, h und k, H&K, heckler, iar, infantry automatic rifle, interim, koch, m16, m16a4, m4, m4a1, m4a1 .

urg, next generation, rifle, surg, upgrade, upper receiver group Since its introduction in 2009, the Marine Corps’ M27 Infantry Automatic Rifle has proven itself as an effective support weapon that offers more firepower and range than the Corps’ other squad level weapons, the M4 Carbine and M16A4 Rifle.

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