PRI Fat Boy gas tube?

[Clint]

I seem to remember an equation about the Pressure Volume and Temperature relationships. That said the Fatboy MUST have some affect on the system.

Yes the port size is primary... I get that.

Yes it has some effect, just not very much...

[patrick sweeney]

I seem to remember an equation about the Pressure Volume and Temperature relationships. That said the Fatboy MUST have some affect on the system.

Yes the port size is primary... I get that.

The various gas laws (Boyle, Charles, Gay-Lussac) can tell you many things about what gases do.

However, in the gas tube in an AR, the metering effect of the port has much to do with the timing and pressure rise of the tube and its effect on the carrier. The ratio of the two has the port diameter causing larger changes in the system than that of the volume of the tube, until you get to absurd tube I.D.

[Heavy Metal]

I did use one of these once in concert with a H3 buffer, to tame down an overgassed Nessard carbine that I bought in the early 90's. It is a beater rifle.

It worked, It runs like a top and eats anything now. I have about 1500 rounds on it with this tube and even ran a LAV carbine class at Blackwater with it just to put it thru the grinder.

[rsilvers]

I have never seen anyone post any valid evidence that DMPS barrels are over-gassed. If it is, then use an H2 buffer. If that is over-gassed, then use an H3 buffer. If that is over-gassed - then you can get another barrel or use an adjustable gas block. Colt ships an M4 that is below 950 rpm cyclic rate. Is the DPMS above that? Doubt it.

[Iraqgunz]

I have seen port measurements well above .063 which makes the. Overgassed. I have also seen numerous out of spec chambers as well.

I have never seen anyone post any valid evidence that DMPS barrels are over-gassed. If it is, then use an H2 buffer. If that is over-gassed, then use an H3 buffer. If that is over-gassed - then you can get another barrel or use an adjustable gas block. Colt ships an M4 that is below 950 rpm cyclic rate. Is the DPMS above that? Doubt it.

[sinlessorrow]

I have never seen anyone post any valid evidence that DMPS barrels are over-gassed. If it is, then use an H2 buffer. If that is over-gassed, then use an H3 buffer. If that is over-gassed - then you can get another barrel or use an adjustable gas block. Colt ships an M4 that is below 950 rpm cyclic rate. Is the DPMS above that? Doubt it.

So in other words.....you dress up a turd?

[rsilvers]

So in other words.....you dress up a turd?

Are you saying that you prefer C and H buffers to H2 and H3 buffers? Why?

[rsilvers]

I have seen port measurements well above .063 which makes the. Overgassed. I have also seen numerous out of spec chambers as well.

What was the cam path? What was the cyclic rate or the peak bolt carrier velocity?

[sinlessorrow]

Are you saying that you prefer C and H buffers to H2 and H3 buffers? Why?

No, I run a H2 in my carbines. My point was instead of fixing an overgassed rifle, slapping in a heavier buffer is polishing a turd. No matter what you do its still a turd.

[markm]

DPMS must have adopted .300 USELESS... and now Silvers is their staunch defender!