Quoted: WOW...those just created even more questions! Bare with me again!
So what is a piston gun and how does it differ from an AR? I really like the POF's but the site wasnt clear on their prices and what you get...$975 for just the upper...or the whole thing? And if i decide to go with an AR, am i better off building one to my specs or buying one straight up?
Sorry, i obviously have very little knowledge on this...but im trying!
Diesel
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You're lucky I have nothing else to do today.
Most people (myself included) normally tell new posters to read the FAQ and use the search button but this time I thought I'd lend a helping hand.
A regular AR15 uses a direct gas-impingement system. When the gun fires, gas behind the bullet is normally siphoned from a hole under the front sight base. That gas travels back down the gas tube and hits the gas key on the bolt carrier, driving it back and cycling the gun. This leads to a dirty weapon over time as the gas goes back into the receiver.
A gas piston AR15 uses a piston and operating rod to operate the action. When the gun fires, gas behind the bullet is once again siphoned from a hole under the front sight base. But this time, the gas goes through a piston and hits an operating rod which is directly connected to (or contacts) the bolt carrier where the gas normally would. This keeps the gun considerably cleaner as no gas (or very little) goes back inside the receiver.
And yes, the POF gas piston uppers are $975 or whatever was posted on their website. But all told, that is a pretty fair price considering the extra parts and engineering that goes into the gas piston, plus the model you probably looked at had a Predator Rail System on it instead of regular plastic handguards, and that raises the price.
As for how to go about getting a gun, if this is your first (and I assume it is), I would get one "straight up" as you say instead of building one. But, if you want to get a complete upper somewhere and a complete lower somewhere else, that would work too, as all you would have to do is push them together. I would wait until I had some "time behind the wheel" so to speak before I would consider building on from a parts kit.
No problem on the questions, better to ask and get it right than stay silent and screw something up.