i've had mod 4's on both my last two ar's.
The PRI gas buster, while expensive, is supposed to be a great choice. I mainly run my suppressor on a 10.5" piston upper with a gunfighter mod 4, with no blowback. There is also a homemade version:
http://www.youtube.com/watch?v=pPoMCQr7pJE
I have a PRI and it does nothing for me either. Maybe I'm just a big wus but I hate that gas blowing in my face. I haven't tried the rtv fix though. I also made my own PRI with a standard charging handle and a dremel tool. No dice.
I also hate the latch on the PRI. Why would they make it smooth? I need something with some traction.
So far the BCM GF is my favorite CH, I just need to do the rtv.
Oh and piston is definitely the way to go suppressed. The 3 piston guns I've shot were nice. A different kind of recoil, not bad just different. I didn't care for the extra weight from the piston rod but on a 10.5" gun it's probably not bad at all.
I love my BCM handle. I accidentally ordered the large latch, but it hasn't been much of an issue to me. I wanted the medium, but I got what I got. So much smoother feeling than a standard charging handle. Easier to operate with gloves on, that's the biggest thing to me.
I never liked the look of the latch on the PRI, but figured for the price, it would do what it was supposed to do. That sucks. I originally had a 16" piston rifle, but didn't care for it. To be honest, I prefer DI on 12.5"+ rifles and piston for anything shorter than that.
To give you a reference, my 10.5" LWRC upper with proprietary 9" rail weighs roughly the same as my 14.5" upper with a 12" DD light rail. However, that 10.5" is a lot more maneuverable, obviously.
I get close to Zero blowback (10.5" with TAC16). Have you tried a Heavy buffer? I have one and I hear that it helps with blowback as well...
I just switched to a spikes t2 buffer but haven't shot shot with it. Doing that today. I am probably going to get an adjustable lo pro gas block and just set it up for running suppressed. I'm debating on going with a Noveske Switchblock on my 11.5" SBR once approved or running an adjustable lo pro and a longer rail. With what I want, it would be a little cheaper to not go with the switchblock but as I said, I hate blowback. The suppressor I have is supposed to be good for reducing blowback as its a reflex style can. Maybe I'm just a wimp. That's entirely possible.
Rtv silicone is the best route to take for blowback. I did it for my 9mm suppressed SBR and its made a world of difference.
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