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Old 11-03-2012, 03:55 PM   #17 (permalink)
diesel_fireman2001
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Join Date: Nov 2006
Location: Oregon

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So I spent all morning and found the famous PBN thread:

Gets good at pg 31:
Smart Parts files gas-through-gripframe patent (Mini affected?) - Page 31

The Magic Box gets brought up at page 36:
Smart Parts files gas-through-gripframe patent (Mini affected?) - Page 36

Doc pops in at page 43,46:
Smart Parts files gas-through-gripframe patent (Mini affected?) - Page 43
Smart Parts files gas-through-gripframe patent (Mini affected?) - Page 46

Tom pops in at page 48:
http://www.pbnation.com/showthread.p...397602&page=48

A quote from Doc in that thread

".... It's a hollow tube fitted to the side of the 'Mag dump chamber, that increases the total volume roughly 20%. This had the effect of lowering the operating pressure from around 400 psi to right around 350 psi.

This, in turn, reduced gas efficiency (shots per tank) by about ten percent.

That's it. That's the only thing it did.

The "made for" SmartMags, simply had two holes drilled on either side of the dump chamber inlet, that roughly approximated the additionbal volume of the external tube.

Again, it didn't do anything. Every claimed aspect was entirely false.

Interestingly enough, another company called Foxhunters, made a version with a smaller chamber. This increased the op pressure from 400 to about 450 psi, and increased gas efficiency by about that same ten percent.

The problem here was that it also made the trigger pull harder (more pressure on both the on-off valve pin, and the bolt and thus the sear) and accellerated sear wear.

Doc."
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Last edited by diesel_fireman2001; 11-03-2012 at 03:58 PM.
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