FNH USA interchangeable extended mount Invector choke tubes for 12 Gauge FNH SLP and the SLP Mark I Shotguns. These choke tubes feature a polished stainless steel construction with a blue anodized accent identification ring. Blue ring includes large, easy to read markings for each style of choke tube. For non-back bored barrels only. Briley Standard Invector Design. Lead only, not for use with Steel.
SPECS: 12 Gauge. Cylinder - .000 in. Skeet - .005 in. Improved - .010 in. Light Modified - .015 in. Modified - .020 in. Improved Modified - .025 in. Light Full - .030 in. Full - .035 in. Extra Full - .040 – in.