CV extractor

[Merc]

Does anyone know the historic details of the "CV" stamped chromium vanadium extractor that's installed on the Eddystone bolt that's on my early M1917 Winchester?

Merc

[RCS]

Both Model 1903 and Model 1917 extractors can be found with the CV stamp, also found a Model 1918 BAR firing pin
with the CV stamp too. It would appear that some parts and replacement parts were made from chrome valdium
steel before WW2. This steel, when heat treated has excellent strength, toughness and resistance to wear.

photo shows a BAR firing pin and Seymour magazine follower that was cased hardened for longer wearP1010044_0040_040.jpgP1010046_0042_042.jpg

[Merc]

Both Model 1903 and Model 1917 extractors can be found with the CV stamp, also found a Model 1918 BAR firing pin
with the CV stamp too. It would appear that some parts and replacement parts were made from chrome valdium
steel before WW2. This steel, when heat treated has excellent strength, toughness and resistance to wear.

photo shows a BAR firing pin and Seymour magazine follower that was cased hardened for longer wearP1010044_0040_040.jpgP1010046_0042_042.jpg

CV alloy makes excellent spring and high speed steel. Was that technology around during WW1 or was this something that came later closer to WW2? Are they common? Were they made by all three OEMs or just one who was having a high rate of failure?

Merc

[Merc]

CV alloy makes excellent spring and high speed steel. Was that technology around during WW1 or was this something that came later closer to WW2? Are they common? Were they made by all three OEMs or just one who was having a high rate of failure?

Merc

Gathering bits of info here and there from other forums - Remington started substituting CV extractors midway through their production run due to a high rate of failure of their regular extractors. Eddystone and Winchester may not have used CV extractors. CV extractors also failed so it may not have been the cure Remington was seeking.

Both chromium and vanadium were around well before WW1. CV alloy steel can be made harder while being less susceptible to corrosion and abrasion. Give Remington an A for effort for trying to improve their product.

Merc