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Just did a test with my expensive HFC134a (man those are hard to find)
I did the test as follow:
134a w/ Stock/ Winter Buffer Spring and Stock Bolt Carrier--NO ISSUE
134a w/ Summer Spring/ AR Buffer Spring and Stock Bolt Carrier --NO ISSUE
134a w/ Stock/ Winter Buffer Spring and RA-Tech Bolt Carrier--NO ISSUE
134a w/ Summer Spring/ AR Buffer Spring and RA-Tech Bolt Carrier --NO ISSUE
Propane w/ Summer/ AR Buffer Spring and Stock Carrier --NO ISSUE (it was the first thing I did)
Propane w/ Winter/ Stock Buffer Spring and Stock Carrier --NO ISSUE
Propane w/ any kinds of Buffer Spring and RA-Tech Bolt Carrier --Major Gas release issue.
I check the bolt carrier the O-Ring is compeltely intact like new, same as the Stock one
The bolt moves smoothly and is nearly swimming in Silicon Oil (Dont want to use WD-40 since it touches hopup) The Only thing that might be a factor to the cycling of the firing mech is the stock tube is a lil loose you slide it from 4-8 o clock (My armourer's wrench is on the way)
I don't have any other mags so far other than GHK. My enchanced AGM one is coming in soon.
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