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I like those pdw stocks but hate the proprietary bcg/buffer set up. Is there some design feature that prevents the use of a normal bcg and a custom made buffer? There must be, right? Could you snap a couple pics of the lower without the upper attacthed? Nice looking pdw by the way.
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Not enough room for a spring back there without a shortened carrier and a short receiver extension.
Gunsmoke Enterprises Gen 1 pistol buffer comes close to what you describe but has all kinds of reliability issues.
It uses a small diameter spring and a plug that slides up into the tail of a standard carrier.
Their Gen 2 buffer tube is similar internally to the NEA setup.
The only other option is a forward action spring like the Faxon, RRA PDS, Oly OA93, ZM LR-300/TTR, Extar or a home built setup like the one in my avatar.