XM177E1

“With its 10 inch barrel, the XM177E1 is a more mobile and lightweight version of the M16A1.”

— in-game description

History

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The XM177E1, along with the US Airforce variant, the XM177 aka GAU-5A, was the first M16-based carbine to be commonly used by the US military. 2,815 XM177E1s were purchased from Colt by the US Army on June 28th, 1966. The delivery was completed in March 1967.

Differences from M16:

The stock was replaced with a 2 position collapsible buttstock. The hanguard was shorter and round, instead of the triangular one used on the M16, XM16E1, M16A1, Colt Model 605, or the shortened triangular handguard used on the GX-5857. The barrel was 10 inches, instead of the rifle's usual 20 inch barrel. Because the shortened barrel increased the muzzle flash and noise significantly, a 4.5 inch moderator was added to the end of the barrel, which functioned as a quasi-suppressor, bringing the volume down to a level around the standard 20" barrel and reducing the muzzle flash. They were originally intended to be used with 30 round magazines, but to problems getting the fully curved 30 round magazine to work in all M16 mag wells the majority of them were issued with 20 round magazines. The 10 inch barrel negatively affected accuracy, and exacerbated some of the reliability issues that the XM16E1 was experiencing at the time. Because of this they were replaced with the XM177E2, and the GAU-5 with the GAU-5A/A, which had 11.5 inch barrels.

Weapon Specifications

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- Full name here -

Ammunition
Ammo Type	55gr M139 FMJ
Rounds Per Magazine	18+1 Rounds
Magazines	8 Magazines
Weight Per Magazine	0.34 kg / 0.75 lbs
Handling
Weight	2.43 kg / 5.36 lbs
Firemodes	Fully Automatic Semi-Automatic
Rate of Fire	750 RPM
Recoil	Vertical: 210 Horizontal: 55
Spread (MOA)	3
Length	825.5 mm (stock extended) 756.92 mm (stock collapsed)
Melee Reach	840 mm
Damage
Instant-hit Damage	100
Damage Value	285
Energy Impulse	176
Penetration Depth	10
Ballistic Coefficient
Velocity	840 m/s