posted on Apr, 18 2010 @ 08:34 AM
reply to post by bowtech
Don't get me wrong here...
I'm a long time die-hard fan of rugers... and while I've yet to handle a SR 556 there are a few things I'm wanting to know about their uppers...
In reality, piston guns certainly run cleaner and cooler, but their superiority in terms of more reliable operation remains unproven. That a gun with
a piston-based operating system should have better potential reliability than one built around a gas tube that dumps carbon directly into the bolt
carrier seems to be self-evident. Generally, that may be true, but when you replace the AR-15’s gas tube with a piston without a lot of testing and
development, you can create more problems than you solve.
The trouble centers around the AR-15’s bolt. Its weight and other design elements are optimized for best reliability in combination with a gas tube.
If energy is transferred to the bolt indirectly by means of a piston or tappet rod rather than directly through a gas tube, the weight of those
components can rob the bolt of the energy necessary to cycle reliably. That is not to say that a piston AR can’t work, just that converting an AR
into a piston gun is a lot tougher than it looks.... if it pans out it could solve a lot of the current complaints about the M4