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Until LWRCs SABR is available, POF is pretty much the only game in town for a piston 308 AR.
Ranier and CWS usually have some stripped POF lowers available.
Adams Arms is working on a 308 version of their retrofit piston system.
I thought you can retro any AR platform to a GPU?
Why is POF the only one that can accept a GPU?
I'm not familar with Ranier or CWS... Are they sponsers? I'd like to call them tom to see if they have any in stock.
What is a good price for a POF stripped lower?
As it stands right now I'm not aware of any retrofit piston systems that have been approved for a large chassis AR10/DPMS308 type system. I suppose you could try to make a retrofit piston designed for AR15 work in a DPMS308 upper, but I certainly wouldn't try it.
As I mentioned Adams Arms has been testing a 308 version of their retrofit since last summer, but it is not available yet.
Primary Weapons Systems who also make a highly regarded piston retrofit, has stated several times that they currently have no intention of producing a 308 compatible system, as the perceived market is too small.
POF only makes piston sytems, and it's just that no one else is currently producing either a purpose built or retrofit 308 system (LWRCs SABR 308 based system is still in the works). The lower used is mostly irrelevent, but fitting a POF upper on a standard DPMS lower takes a few special parts, so it would simply be easier to use POF upper and lower.
The stripped 308 lowers commonly go for $450 or so. Ranier Arms and Cold War Shooters can be found in the Industry section. To my knowledge they are both currently out of the 308 lowers.
I also believe the term "GPU" is used by Addax Tactical to describe their Primary Weapons Systems based 5.56 and 6.8 uppers. Again they will not retrofit a 308 based system.