AR 15 piston conversion

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TJ, I know you aren't trying to pick a fight. You're a little passionate, yes and that's ok by me. I get that way too.

The thing about the AR as designed is that as long as it's kept wet, it runs except in the most dire of circumstances. Nearly twenty years ago a friend related his experiences with the M16 he carried in the Army. Blanks are very filthy. After firing a bunch of blanks during excercises, the cyclic rate of his rifle would slow down. He kept a bottle of CLP on his helmet band and when the ROF slowed, he'd give a squirt into the BCG and it'd pick right up again.

As far as the piston rod conversion goes, it still needs cleaning to run. Dirt ends up in a different place.

Added complexity is not synonymous with overwhelmingly complex, but there are extra parts critical to function. An extra 6 ozs. on a carbine is noticeable, at least to me and also to several others I've talked to. I notice the extra weight more than I notice the shift in balance. If I'm going to add 6 ozs. to my rifle, it's going to be in the barrel where it can help handle the heat. Speaking of heat, the op rod gas block runs hotter and keeps the heat at the barrel. TANSTAAFL.

From what I've seen, the op rod conversion functions, but it doesn't make an AR better than it was.

The AR as designed is simpler, lighter, just as reliable and just as durable.

But step back for a moment and study how an AR is put together and how recoil affects the shooter. There is a reason Stoner shortened up the reciprocating mass, placed it as close to the butt as possible and lined it all up with the bore of the rifle and the shoulder of the shooter. He did so while keeping it very simple.

Take a look at the AK. Poor ergonomics, heavy and long reciprocating mass with a good portion of it above the line of recoil and way out in front of the rifle where the shooter's body mass has less control of it. It's obvious why an AK has poor recoil control compared to the AR.

That's why I say adding the op rod to the AR is a step backward in recoil control
 
The in-line system of the M16 and its light bullet do a very nice job of reducing muzzle climb. When the Sov switched to 5.45x39 they used a pretty complex brake-compensator to get the muzzle climb under control.

As far as weight of reciprocating masses goes: the M16's and AK-47's bolt and bolt carrier weigh almost exactly (10 gram differrence) the same, if you include the M16's buffer.

BSW
 
c.latrans,
I am glad you are learning more than you had expected.
Eugene Stoner was a very bright man who created a tremendous machine. Some say it is perfect and needs no modifications. Some disagree and say why not try to improve it? If someone told me I could only have one AR rifle and I had to pick between DI and GP, I would go DI without a second thought.
That said, I still maintain that if you want to shoot with a GP rifle, I would encourage you to buy the complete upper. Leave the DI alone, Armalite is a fine weapon and it will give you many years of reliable service as is.

Good luck with whatever you decide.
 
All great arguments and very interesting. Certainly the DI came after the rod & piston for a reason, the DI pretty much defines an AR, actual non-combat differences are not that great, and some don't like the gas in their face (I don't even notice it).

So my conclusion is why change it... buy another with a piston. But if you insist and just want to do it to play around with your AR, then have fun. After all, if I tried to justify my guns along some practical guidelines I wouldn't have any. Have fun
 
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