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Piston chat..

This is a discussion on Piston chat.. within the Art Luppino forums, part of the Gun Professionals category; Originally Posted by Capona tony, it doesn't eject brass as far? Or at a different clock position? The brass doesn't eject as far. Most of ...


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Old December 13th, 2016, 04:18 AM   #31
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Originally Posted by Capona View Post
tony, it doesn't eject brass as far? Or at a different clock position?
The brass doesn't eject as far. Most of it (the SPEER 125's) just kind of falls out of the action and it gently rolls off the bench.

Tony.

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Old December 17th, 2016, 11:06 PM   #32
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Art,

Could you give us an idea of what you consider a fast piston vs. a slow piston?

My old M1A, which has always shot as well as I could ask it to, currently has a piston (Sadlak) in a USGI unitized gas cylinder (Hueygunner) that, when I point the rifle up at 45 degrees and lock the bolt back, I can just say "Mississippi" then *click*. It's about a second or a bit less.

What would a fast or slow piston be, say in Mississippis?

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Old December 18th, 2016, 05:56 AM   #33
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Originally Posted by jywolfe View Post
Added a piston worksheet. Headed to the range and will update later.

Measured diameter at port, diameter at tip, total indicated runout from those locations, face concentricity and mass.

Note the difference in diameter for Brookfield Piston.
According to the drawings, only four of the listed pistons are to print.

#1, #5, #7, and the Bula

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Old December 18th, 2016, 06:04 AM   #34
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Originally Posted by XM25Ren View Post
Not an expert but I do know that the NM grooved piston was meant for the heavier bullets ie. 168 and 175. Anything lighter may not cycle the action.

REN
The stock GI M14 gas system is over gassed, for the average shooter in temperate weather. It was designed to work with the lowest possible expected port pressure in arctic climatic conditions, without lubrication.

It can leak, loose, have bleed off, a lot of gas before it starts to have serious trouble.

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