FWB 65 - one spring model vs. 2 spring

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mad dad
Posts: 3
Joined: Tue Aug 27, 2024 8:41 pm

FWB 65 - one spring model vs. 2 spring

Post by mad dad »

Feinwerkbau 65 pistols were made with a single mainspring, then later had 2 springs - a thinner spring inside the mainspring. The mainsprings from the two configurations have different part numbers. Do any of you here know the different characteristics of the two springs? I have a spring from a single spring gun, but my pistol is the 2 spring model. I'm debating whether or not to assemble it with the spring from the other model. Thanks.
kevinweiho
Posts: 949
Joined: Wed Oct 14, 2009 12:44 pm
Location: Costa Rica, Central America

Re: FWB 65 - one spring model vs. 2 spring

Post by kevinweiho »

The FWB 65 with a single spring, produces around 475 fps with a 7.0 grain pellet, while the two spring version goes up to 525 fps.

I think oem single springs are compatible within the 65/80/90 series.
Deardorff
Posts: 3
Joined: Mon Aug 05, 2024 5:16 pm

Re: FWB 65 - one spring model vs. 2 spring

Post by Deardorff »

Does anyone know where to buy springs for the fwb 65?
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