“SilencerCo AC59 Osprey/Octane Piston .5x28XL 9mm Stainless Steel” has been added to your cart. View cart

American Precision Arms G4F5860S Gen 4 Fat Bastard Self Timing Steel 5/8″x24 Threads 3.30″ OAL 1.10″ Diameter 6mm

SKU: ss_177590

UPC:

$177.06

Availability: 3 in stock

The new calibrated U.R.P tunable top ports have been designed for maximum adjustment making the Gen 4 line of brakes the flattest shooting brakes available hands down. By testing port size, location, and how the gas feeds into them, we have been able to make these tunable top ports capable of generating zero vertical movement.