OW "adjustable" and "tunable" are two totally different types of blocks. Yes, both are "adjustable", but very different and used for different reasons. The "adjustable" is a click style, the "tunable" is a dual-screw set-it-&-forget-it style. For quick gas changes, do not use the "tunable" block.
Here's my review, which I did not post at time of my install.
This 750 SS "tunable" has poor finish, it needed to be deburred. It's a poor finish on a poor-ok-excellent scale.
This shard sticking up into the gas tube area! For the price I was expecting excellent finish.
Block gas port is dead-nuts 125.
The tune screw threading appears to be class-2, but I would prefer class-3 fitment here.
Over gassed?
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