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If shooting 18" suppressed, I highly recommend going RLGS unless you have a flow-through can.
The LaRue 18" MLGS with Tranquilo suppressor are designed to work together from under the same roof.
Most 18" MLGS set-ups, even with .076" gas ports, have too much plug dwell and accumulation with a suppressor, so back pressure causes too fast of a cyclic rate, resulting in more wear on critical parts like extractors and bolts. Even with adjustable gas, you can't really get it into the happy cyclic rate window all of the time.
With RLGS 18", you stay in the happy window of cyclic rate for AR15 gas system timing.
We always use the Intermediate Gas Length on 18 inch barrels.
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