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Old June 14, 2013, 02:36 PM   #62
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Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,996
To me, the worst potential problems of the various piston AR designs are parts availability and quick repairs, especially over the long run. If your DI AR needs a part you have your choice of hundreds of vendors selling standard parts, and you can install them yourself or have a local gunsmith do it. If your Ruger piston AR (for example) breaks, you must get parts from Ruger, and they may not provide them to you - you likely will be told to send the rifle to them or an authorized service center, not you or your local gunsmith. And if a proprietary piston design is ever orphaned, well you'd better start scrounging for parts now...

And with so many piston designs out there it's fair to assume a shakeout of some kind where some designs will be abandoned. You could be stuck with Beta vs. VHS or HD-DVD vs. Blu-ray.
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