I have a criterion 14.5 hybrid contour chrome lined barrel with a pinned geissele gas block available. barrel has 80 rounds through it, just decided to switch my build up to a light weight setup so switching to a pencil profile or something. These criterion barrels are insanely accurate. Barrel has some very light surface Mark's from installing gas block. The pin Is drilled straight and a drill press and jig were used. It is also notched at 12:00 position for a secondary anti rotation pin. It's about as bomb proof of a setup as you could have. Gas block is the masonite version. 1-8 twist 223 wylde chamber. Mid length gas. 260.00 shipped
