time will tell

[TEXASforLIFE]

Not as much info as I'd hoped for, but still informative. I'm awaiting on a cmmg 5.7 radial delayed AR conversion (not the pcc mag style) and watched this vid.

While it was about 9mils it did have reasonable info about recoil energy and how it was displaced. I haven't been able to find a side by comparison between the radial and roller styles like the straight and radial as linked above. Now for the "what buffering system I need and weighted buffer" question to be found or asked (probably from cmmg) for best answer?

https://www.midwayusa.com/product/1024818739?pid=461437 is offered in 3 barrel lengths.

 

[Funwithfuel]

ROLLER DELAYED SYSTEMS – Maxim Defense

maximdefense.com

You could look at this, it's roller delayed vs radial, more like hk, but not. If I could justify a 9 PDW (if I could even get one) it's something I'd consider.

 

[TEXASforLIFE]

tentative build

working on a pistol version build and clearly unsure of rules of so. I'll add pics/links of what could be possibilities?

 

[TEXASforLIFE]

Odin Works CQ-S Close Quarter Collapsible Stock AR-15, LR-308 AR-15

The Odin Works CQ-S (Close Quarters Stock) combines ultimate maneuverability with rapid deployment by utilizing a highly compact, spring-loaded system....

www.midwayusa.com

 

[TEXASforLIFE]

Strike Industries PDW Collapsible Stock AR-15 Black

The Strike Industries PDW stock represents the pinnacle of ultra compact PDW systems. At the compressed position, the compact PDW stock allows for...

www.midwayusa.com

 

[TEXASforLIFE]

Stern Defense RAB-AD Rapid Attach Stock Adapter AR-15 Black

The Stern Defense RAB-AD Rapid Attach Buttstock Adapter allows you to greatly reduce the length of your firearm for compact storage and easy...

www.midwayusa.com

 

[TEXASforLIFE]

LWRC PDW Stock Kit LWRC Standard Piston AR-15 Lowers Black

Add the LWRC PDW Stock Kit to your LWRCI 5.56 NATO or 6.8 SPC piston rifle to add that bit of flair or shorten the overall length. When stowed the PDW...

www.midwayusa.com

 

[TEXASforLIFE]

Armaspec XPDW Gen 2 Stock AR-15 Black

The Armaspec XPDW Gen2 stock is an aluminum 5 position stock with hardened steel rods. It incorporates a low profile lightweight aluminum latch carrier...

www.midwayusa.com

 

[TEXASforLIFE]

Not sure if I have to go ONLY pistol tube or carbine tube that will not accept a stock as barrel length is 8.5" and nothing to pin on it to be 16"+. Maybe @HansGruber or @KillerFord1977 will be my go-to's unless others know the ins and outs of this nightmare from atf regulations?

 

[TEXASforLIFE]

BTW, I don't have a living will to add class3 or anything requiring tax stamps. Lower isn't registered as rifle as I've decided on this with ALL lowers so not too have issues later when changing lowers to other uppers.

 

[KillerFord1977]

Not sure if I have to go ONLY pistol tube or carbine tube that will not accept a stock as barrel length is 8.5" and nothing to pin on it to be 16"+. Maybe @HansGruber or @KillerFord1977 will be my go-to's unless others know the ins and outs of this nightmare from atf regulations?

https://www.atf.gov/file/154866/download

 

[TEXASforLIFE]

https://www.atf.gov/file/154866/download

yikes! braces are a pita to figure out as too closely resembling each other. Thanks

 

[TEXASforLIFE]

So, you have to file for braces, but not tubes only.........correct?

 

[Bassbob]

So, you have to file for braces, but not tubes only.........correct?

Correct. As far as I know as long as you don’t have a brace on you can do whatever you want.

 

[TEXASforLIFE]

I will state this about the radial delayed blowback in 5.7 compared to the ps90 and the ar57, there's less sight movement on the rdb than the other 2. No experience in the hk version, but the rdb is very smooth. I'll be getting pistol versions in 9 and 45 also. I'm using a carbine length tube that DOESN'T accept stocks (it's made the same as a pistol tube, but longer). I'm using a flatwire spring w/ 3oz carbine buffer. I might try as far down as 2ozs as that's even less reciprocating mass.