Please measure your low profile gas block dimensions, as some are longer than others.  GPT is made for Crane Mk12 pattern low profile gas blocks, the length of which is 1″.  GPT can be modified to accommodate longer gas blocks.  If you’re unsure, please contact the gas block manufacturer, below are the compatible gas block dimensions:
MAX gas block length: 1.00
MAX gas block height: 1.35
Randy, mallard green GPTs have minor scratches that can’t be felt by fingernail or fingers, they’re also a darker green than ODG, we marked those down because like Randy, they’re imperfect.  As a gas block jig, it’ll get scratched and beat on literally, these almost invisible scratches are but cosmetics.