05-11-2020, 11:21 PM
A key step in gas tube and block installation is aligning it with the carrier key.
Place a stripped carrier with key inside the upper receiver with the upper upside-down.
Slide the gas tube and block over the barrel onto the journal after having taken your measurements for gas port alignment, and then slide the gas block with tube into position, ensuring that the carrier key does not bind.
The inverted upper will simulate magazine cartridge stack pressure up against the bottom of the carrier, pushing it to its maximum height inside the raceway in the upper, and therefore replicate correct position of function for interface with the gas tube.
Gas tube binding is a problem if assembled incorrectly, and it sounds like you had rotational binding with the barrel nut against the side of the gas tube as well.
Place a stripped carrier with key inside the upper receiver with the upper upside-down.
Slide the gas tube and block over the barrel onto the journal after having taken your measurements for gas port alignment, and then slide the gas block with tube into position, ensuring that the carrier key does not bind.
The inverted upper will simulate magazine cartridge stack pressure up against the bottom of the carrier, pushing it to its maximum height inside the raceway in the upper, and therefore replicate correct position of function for interface with the gas tube.
Gas tube binding is a problem if assembled incorrectly, and it sounds like you had rotational binding with the barrel nut against the side of the gas tube as well.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com