I am looking for something that may or may not exist

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kingfish

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I am wanting to put together a 5.56 PDW. I need an upper that will fit a milspec AR lower that I have already registered. What I am looking for is 7-8 inch barreled upper, but is designed and has a collapsible two rail stock like an MP5. It would need to be a gas piston system to eliminate the buffer tube. I know there are uppers that use impingement systems but have a shortened tube to allow a collapsible stock, but am hoping to find a receiver that will meet my above specs. I do realize there would need to be some significant mods to a standard upper to accommodate the retracted rails so maybe that's why I have had no luck so far finding what I am looking for. A complete upper would be nice, but am willing to build it if I can find just the upper receiver and stock. Any help or guidance on this would be appreciated.
 

rc508pir

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I think the SB Tactical AR brace is the closest to what youre talking about. IIRC the buffer tube is shorter than a pistol buffer tube

I dont know of any Piston gas systems for the AR that dont use a lower with a buffer tube or use a short carrier like the Sig Rattler or FN Scar

All in all, the Sig Rattler (or what ever the eff they call it) is pretty much what youre discribing
 

Duncandl

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I have the Troy PDW collapsible stock with the 2 rails, it uses its own BCG. Not sure if they are still available anywhere, I was going to use it to convert my SBR to a PDW with my 8.2 Noveske barrel for 300BO.
 

Duncandl

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3B3F4E4B-6419-4E54-A3E1-9759CE7B4137.jpeg
 

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