What kind of handguards are these?
- Thread starter Power Pill
- Start date
5.56x45mm/5.56 NATO:
In November of 1962, Frankford Arsenal loaded a small quantity of .223 Duplex cartridges. This consisted of a forward bullet of 33 grains followed by a second 34 grain projectile. The velocity is quoted as 2,760fps.
During the late '60s, Frankford Arsenal experimented with the Low Noise Duplex Cartridge (LNDC). The earliest cartridges were loaded with a pair of 110 grain tungsten core slugs. The initial projectiles use a blunt round nose profile, but later efforts consist of a semi-spitzer shape.
During the late 1980s, Olin produced three different types of duplex 5.56x45mm ammo for Colt's entry in the Advanced Combat Rifle (ACR) trials. The original version used a special long-neck case which held a saboted pair of tungsten sub-projectiles. An interim version switched back to the standard length case firing a saboted pair of 27 grain .158" tungsten sub-projectiles. The final version used the standard case with a pair of .224" projectiles weighing 35 grains (front) and 33 grains (rear), giving a velocity of ~2,900fps. The Bodermansports.com website claims to have some of the ACR test ammo available. Reportedly, during Operation Desert Shield, the USMC approached Olin about making a production run of the full-bore 5.56mm duplex ammo. Olin declined.
h t t p://www.thegunzone.com/salvo.html
In November of 1962, Frankford Arsenal loaded a small quantity of .223 Duplex cartridges. This consisted of a forward bullet of 33 grains followed by a second 34 grain projectile. The velocity is quoted as 2,760fps.
During the late '60s, Frankford Arsenal experimented with the Low Noise Duplex Cartridge (LNDC). The earliest cartridges were loaded with a pair of 110 grain tungsten core slugs. The initial projectiles use a blunt round nose profile, but later efforts consist of a semi-spitzer shape.
During the late 1980s, Olin produced three different types of duplex 5.56x45mm ammo for Colt's entry in the Advanced Combat Rifle (ACR) trials. The original version used a special long-neck case which held a saboted pair of tungsten sub-projectiles. An interim version switched back to the standard length case firing a saboted pair of 27 grain .158" tungsten sub-projectiles. The final version used the standard case with a pair of .224" projectiles weighing 35 grains (front) and 33 grains (rear), giving a velocity of ~2,900fps. The Bodermansports.com website claims to have some of the ACR test ammo available. Reportedly, during Operation Desert Shield, the USMC approached Olin about making a production run of the full-bore 5.56mm duplex ammo. Olin declined.
h t t p://www.thegunzone.com/salvo.html
From the 80s. Too much Cocaine.
OK, other oddballs I came across. I know these are all experimental. Anyone?
Those are the 4 ACR entries: AAR, HK, Steyr and Colt.
The Steyr is the most efficient piece IMHO - flechette in a polymer case.
