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 Post subject: Semi-Auto Piston Problems
PostPosted: Mon Feb 22, 2021 3:22 pm 
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Joined: Mon Feb 22, 2021 2:59 pm
Posts: 7
I’ve got a semi-auto vrbp 100 from RIA, which comes with both a light and heavy piston, and I’m having a little bit of a hard time understanding the distinction.

Manual says 2 3/4” shells get the light an 3” get the heavy, but isn’t that just shorthand? Are 3” shells always going to shoot more gas into the piston than 2 3/4, or are there 2 3/4 shells that would count as “heavy” loads? If so, what number should I be looking at, shot weight, FPS, or both?

Thanks in advance.




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 Post subject: Re: Semi-Auto Piston Problems
PostPosted: Mon Feb 22, 2021 4:46 pm 
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Joined: Sat Sep 09, 2006 11:02 am
Posts: 27191
Location: Plainfield, IL
ALWAYS start with the heavy piston. Only if the gun does not cycle with the shells you are using, do you switch to the "light" piston.

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 Post subject: Re: Semi-Auto Piston Problems
PostPosted: Mon Feb 22, 2021 7:55 pm 
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Joined: Mon Feb 22, 2021 2:59 pm
Posts: 7
Perfect, thanks!


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