JP recoil spring system

[Drifter]

Just announced at SHOT last month, and not in stock yet at JPE, so best bet might be to contact JPE directly for info on how the system might work with the Grendel. Since they build Grendel rifles, they have probably tested it. (And wouldn't surprise me if the system has already been in use in the rifles they build, and the item is only "new" as an individual component.)