I own both a LAR-PDS rifle (SBR'd) and a pistol. I've been tinkering with them and have some gas port/regulator questions. They're directed mainly at Steve but if anyone else has some input, please chime in...
-On the rifle, if I cut the original barrel down to 11.5", would I also have to open up the gas port? I know this is common practice on direct impingment guns, but does it matter as much with a short stroke piston system like the PDS? I compared the gas ports between the 16" and 9" barrels and the rifle has a smaller port. I'm assuming if I opened it up as much as the 9", it'll work just fine? Or can I just leave it as is?
-On the pistol, I have a crazy idea for a 9mm conversion. I've researched the topic of DI 9mm ARs quite a bit and all signs point to 'no' unless using custom loaded ammo. But then I thought a piston system might be able to work. Problem is, the PDS gas block is way forward from where you can get any decent pressure; a generic 9mm graph shows around 5000 psi at ~6" of bullet travel (distance from breech to gas port on a PDS pistol). So here's the question: I know there're lots of variables but...approximately how much gas pressure/time is required to make the PDS recoil system operate, asuming you keep the same dwell time? (2.25" from gas port to muzzle)
-Aside from 9mm, I'm also considering 300BLK. I know RRA plans to release one but I don't want to wait anymore. It'll be around 8.5-9" like the RRA barrel but not sure of the proper size for the gas port. Steve is that something you can share or is it proprietary?