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Pedersen device

Pedersen device
Diagram illustrating the device
Weapon information
NamePedersen device, officially US Automatic Pistol, Caliber .30, Model of 1918
Place of originUnited States
Service history
In service1918-1931
Used byUS Army
WarsWWI
Production history
DesignerJohn Pedersen
Designed1917
Produced1918-1920
Number built101750
Specifications
Weightapprox. 1 lb (0.5 kg)
Cartridge.30-18 Auto
ActionComplete Blowback (arms)
Feed systemDetachable single-stack box magazine (40 rounds)

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The Pedersen Device is an attachment developed during World War I for the M1903 Springfield rifle that allowed it to fire a short 0.30 (7.62 mm) caliber intermediate cartridge in semi-automatic mode. This wonder weapon was developed to allow infantry to dramatically increase their rate of fire while on the move, while also allowing the rifle to be used in conventional bolt action mode for long-range fire from the trenches.

Production had just ramped up when the war ended and the Pedersen Device ended up in storage after the war. Most were later destroyed as surplus and the few surviving examples are extremely rare collectors' items. In March 2008, a 1918 Mark I Pedersen device and a few boxes of ammunition that were owned by the estate of Connecticut attorney Bruce Stern were sold at auction for US $55,000 (US $60,250 with buyer's premium).

Pedersen device Video

I made a 2nd video of my Springfield 1903 Mark I, caliber .30-06, watch that one the quality is better. According to the serialnumber it was made by Springfield Armory in 1919, the barrel is also marked with SA, 11-19 and the Flaming Bomb. Towards the end of the worldwar 1, Springfield turned out the Model 1903 Mark I. The Mark I has a cut on the left hand side of the receiver meant to act as an ejection port for the Pedersen device, a specialized insert that replaced the bolt and allowed the user to fire .30 caliber pistol cartridges semi-automatically from a detachable magazine. The stock was also slightly cut down on the left side to clear the ejection port. In all other respects, the Mark I is identical to the 1903. My rifle was re-issued during WW2 and fitted with a scant stock. The "scant" stock came about in late 1941 when the Ordnance wanted to standardize on a pistol-grip stock for all M1903 rifles. There were already many thousands of stock blanks on hand that were sized for the old straight stock. They were not deep enough to get the full pistol grip of the Type C (modified) stock that had been standardized in 1929, so the drawing was modified to allow a "scant" grip to be used. This was the largest grip that could be formed from the old stock blanks. This all occurred before the 1903A3 was standardized, and early "scant" stocks will only fit on a 1903, and will not fit an 03A3. They were made by Springfield in early 1942, and will be marked with a small "s" in <b>...</b>
1.03 min. | 5.0 user rating		 A quick look at a 1903 Mark 1, with the modifications to allow it to use the Pedersen device.
4.50 min. | 5.0 user rating

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US infantry weapons of World War I

Side armsM1911 pistol * M1917 revolver * M1909 revolver
RiflesM1903 Springfield (Pedersen Device) * M1917 Enfield
Automatic riflesChauchat * M1918 BAR
GrenadesF1 * Mills bomb * Mk 1 * Mk 2
ShotgunsWinchester Model 1897 * Winchester Model 1912
Machine guns and largerM1895 Colt-Browning * M1909 Benet-Mercie * Lewis Gun * M1914 Hotchkiss * M1917 Browning
Cartridges.45 ACP * .38 Special * .30-06 Springfield



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