Originally Posted By: TxPigKillerYou guys are a wealth of knowledge. The 190s were my top pick for the gun but it wouldn't cycle. It's hotter than a rocket with the 110s, actually put in a heavier buffer just to slow the action down.
I have no idea how to make a gas port adjustment. The equipment was bought from Model 1 Sales in TX, perhaps they can help me out.
Thanks again for all your input.
if its a 16" carbine gas barrel - that heavier buffer is probably part of the issue. not necessarily.. but probably.
general rule of thumb for a 300 blackout is as follows
pistol gas = standard spring and h2 (4.5oz) buffer
carbine gas = standard spring and carbine (3oz) buffer
the 110 vmax factory loads are known to be a touch on the hot side. hornady loads them for zing. so if you're running a pistol gas barrel - its very common for them to be over-gassing that config.
however with your inability to run the 190's unsuppressed i'm guessing you have a carbine gas upper/barrel.
if thats the case - i would want to check gas block alignment first and foremost. especially if it was cycling too fast with the 110's where you felt the need to go to a heavier buffer system.
what you'll be looking for is a nice clean carbon ring around the gas port. if the carbon ring intersects the gas port - you've got an alignment issue. this is a random pic from the web of a properly aligned gas block and the carbon ring i described
this pic is one where you can see the ring is touching the gas port. this one is close enough to normal that its probably not a prioblem, but touching the edge like this is not what you want. anything more and you definatly have a problem
the other thing i'd want you to check even before that is if you have a leaky block. if your gas system is leaking - you'll know it... it tends to leave carbon trails quite readily. again here's a couple example pics pilfered from random places on the web
leaking twoards the end of the barrel
a pretty extreme leak towards the chamber side
you sometimes even see it just on the gas tube itself, not at the barrel
if you see any signs like this, i would start there and address those issues - i bet you'll get that upper running if thats the case.
if you do pull the gas block to check the alignment, while you're in there measure the gas port for us. knowing that measurement may help us provide you with a good solution - again assuming that the port is properly aligned and you dont have a gas system leak.
hth