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If I'm going to get something other than a D.I. AR, I'd opt for something like the PWS MK116 instead. Once you go proprietary, the whole argument about parts compatibility goes out the window, so a piston AR is on a level playing field with something like the SCAR.
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I didn't say a thing about parts compatibility. That had nothing to to with my point. The only things a piston system change are the bolt carrier, the gas system, and potentially the handguard, you may just need a shorter one if you have a rail system that goes over your gas block. Other than those few things the parts compatibility remains the same. My main point in my posts was that the SCAR 16S really doesn't have anything AR-15s dont and that I could have a lighter weight DI or piston ar by using a light profile barrel. Look at LWRC, the M6 is lighter than the SCAR. I could also have an AR with a reciprocating charging handle.