I picked up one of these gas blocks while placing an order for another product. It's price is comparable to many non-adjustable models.
The product description inducates "semi-press fit". Every hole that was not threaded was slightly too small. It fit nicely on an Odin Works 6.5 Grendel barrel. But, wouldn't fit onto a Ballistic Advantage 308 barrel. I had to ream out the barrel bore, gas tube hole and roll pin hole to make it work.
Also, the adjustment locking screw is in the rear next to the gas tube, which means you must have the handguard removed to adjust it.
If you don't mind possibly having to fit it to your barrel and gas tube, it works fantastically.
Regular Price: $34.95
Special Price $29.95