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Groved or Slotted Pistons

This is a discussion on Groved or Slotted Pistons within the Art Luppino forums, part of the Gun Professionals category; I have 2 friends that use the grooved pistons in their match rifles. I do not believe they make the rifle more accurate, but whatever ...


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Old December 13th, 2016, 07:43 PM   #31
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I have 2 friends that use the grooved pistons in their match rifles. I do not believe they make the rifle more accurate, but whatever voodoo they produce seems to make the shooters more accurate.

Personally, i use the Schuster overbored/vented gas plug on all my rifles.

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Old December 13th, 2016, 07:57 PM   #32
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? has anyone done a grouping/crono test with the same loads using the different pistons?

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Old December 14th, 2016, 03:11 AM   #33
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When will you be making these available to forum members?
When I can make one in less than 4 hours . . .

At the current cost of machine time, that alone would result in $140, then there is the cost of material, tooling, and labor.

. . . and find a better way to heat treat it - that involves something more efficient than a MAP torch.

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Old December 14th, 2016, 07:44 AM   #34
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Originally Posted by CaissonSeven View Post
Art -in Lee Emerison's "M14 Rifle Histoy and Delvelopment", pg 131, starting @ paragraph 2 -the text describes the origin of the concept at Picatinny Arsenal and the benefits of same.

I would have copied and pasted but not certain of the ramifications.
HTH

Ted Brown -"The groove serves to relieve any excess pressure in the system."

Exactly, it was designed to equalize pressure.




Groved pistons and reduced pressure seem to be the reason for the modifications. Reduced pressure allows heaver bullets without damage to the system is the claim,, nothing wrong with that if you want to use heavy bullets.

The Match M14 was going out of the system before the Piston issue was resolved, too bad for us...

This leaves us where we started: Some pistons give better accuracy than others, I accept that as a fact, even if I don't know why...

Next week I plan to swap out pistons in two M1A's, one is more accurate, and see if the situation reverses. Thanks guys... Art

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Old December 14th, 2016, 08:24 AM   #35
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I've seen Carl Leisenger at the range testing his builds. He brings 10 USGI pistons and tries each to see which gives the best group.

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Old December 14th, 2016, 12:25 PM   #36
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Anyone know why the gas hole in the piston was not simply made smaller?
If having a smaller hole worked well, that would have been a much easier and less expensive solution. And if the starting size of the hole was intentionally made too small, then reaming it larger would be much simpler than milling a groove/slot.

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Old December 14th, 2016, 02:12 PM   #37
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Anyone know why the gas hole in the piston was not simply made smaller?
If having a smaller hole worked well, that would have been a much easier and less expensive solution. And if the starting size of the hole was intentionally made too small, then reaming it larger would be much simpler than milling a groove/slot.

Jay Kosta
Endwell NY USA
Arctic conditions.

Troops can't drill out their pistons, and the Army was unwilling to spend half a million dollars to make a match piston (and introduce a new supply item).

Why Sadlak, et al., don't offer such an item is beyond me.

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Old December 14th, 2016, 02:57 PM   #38
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Isn't Jeff at Bula Defense is making pistons. I would run it past him.

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Old December 19th, 2016, 12:12 PM   #39
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Remember that we used to drill a 1/16" hole in the gas plug to do the same thing. That was dropped too. The standard size hole in the gas piston was designed to shoot standard M80, M118 and M852 loads. It works well. I used to shoot 180 SMK (Mexican Match) for 1000 yards and never changed anything in the system for the heavier bullets. It worked fine. Everything else was just Hype. Over the 30 years that the M14 was our primary advanced marksmanship service rifle, we tried lots of things, but what worked best was building consistent rifles and developing shooters skills. The M14 was and still is capable of shooting as accurately as any other rifle. Everything else is up to the user.

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