The Maxim Defense Industries SCW Acc Gen 7 Buttstock Assembly is considered a stock. So if you have an SBR Daniel Defense PDW the Maxim Defense Industries SCW Acc Gen 7 Buttstock Assembly can be used. If you have a PDW pistol with a brace the Maxim Defense Industries SCW Acc Gen 7 Buttstock Assembly cannot be used. You will need to follow the ATF regulations regarding AR Pistols.
Yes, this Maxim Defense Industries SCW Acc Gen 7 Buttstock Assembly is the buttstock assembly only. As long as you have the SCW buffer kit, you can replace the brace with this stock.
Yes, this Maxim Defense Industries SCW Acc Gen 7 Buttstock Assembly will replace the brace you currently have on your PDX.
Yes. I used Installed this Buttstock after my eForm 1 was approved, and my Tax Stamp was received which converted my AR Pistol into an SBR.
Yes, they should be compatible.
This item is a buttstock so there is not method of using this on a pistol. You will need to look into the regulations for an SBR if you wish to put it on a short barrel firearm.