Ian
Notorious member
I've been working on this one for a while.
The 300 Blackout barrel is just over 16" long with the permanently-attached-per-ATF guidelines ventilated, 4130 steel shroud that tucks neatly under the handguard. The rifled part is 10.5" long counting the chamber. With an outside-threaded muzzle brake, it is ready for a silencer that has an OD of less than 1.5". I can change the muzzle device with a tool I made that goes in from the front since the welded-on rear cap of the shroud is pressed, blind-pinned, and welded to the barrel behind the muzzle threads, or use a direct-thread type silencer. The handguard can still be removed by taking out the eight screws that attach it to the barrel nut and slide it forward over the barrel shroud. Unfortunately, one of the trade-offs of extending a short barrel with a shroud like this is that the gas block is forever captured on the barrel by the extension, though it is possible to loosen the screws and slide the gas block forward enough to service or replace the gas tube. Just in case, I installed an adjustable gas block because it is "fo-evah".
Just for fun, I painted this one to resemble a popular "Black" camouflage pattern and stuck a SlideFire stock on it. As pictured with an empty magazine it weighs 7 lbs. 6 ounces.
The 300 Blackout barrel is just over 16" long with the permanently-attached-per-ATF guidelines ventilated, 4130 steel shroud that tucks neatly under the handguard. The rifled part is 10.5" long counting the chamber. With an outside-threaded muzzle brake, it is ready for a silencer that has an OD of less than 1.5". I can change the muzzle device with a tool I made that goes in from the front since the welded-on rear cap of the shroud is pressed, blind-pinned, and welded to the barrel behind the muzzle threads, or use a direct-thread type silencer. The handguard can still be removed by taking out the eight screws that attach it to the barrel nut and slide it forward over the barrel shroud. Unfortunately, one of the trade-offs of extending a short barrel with a shroud like this is that the gas block is forever captured on the barrel by the extension, though it is possible to loosen the screws and slide the gas block forward enough to service or replace the gas tube. Just in case, I installed an adjustable gas block because it is "fo-evah".
Just for fun, I painted this one to resemble a popular "Black" camouflage pattern and stuck a SlideFire stock on it. As pictured with an empty magazine it weighs 7 lbs. 6 ounces.