My 20" runs just fine with the A5H2 with a sprinco spring and with an A5H3 with a standard rifle spring. Same goes for my 18" upper for an additional data point.
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My 20" runs just fine with the A5H2 with a sprinco spring and with an A5H3 with a standard rifle spring. Same goes for my 18" upper for an additional data point.
With an LMT e-carrier, I was able to run an A5H4 with the Springco green before I started using an adjustable gas block. Total reliability even with tula, while filthy.