05-20-2018, 03:13 AM
You shouldn't have any gas dialed down on 18" RLGS Grendel from the start. Leave the port fully open as the dwell time is very minimal due to Grendel bore diameter and pressure relief close to the muzzle.
What bolt carrier do you have?
28.2gr of XBR under a 123gr is plenty to drive all Grendel gas system lengths/barrel combos in my experience, so something is off here, especially since you tried it in a 20" and got the same results.
Did you try different mags?
I know some of my old CProducts mags won't lock back correctly, whereas others like Elander lock back fine.
What bolt carrier do you have?
28.2gr of XBR under a 123gr is plenty to drive all Grendel gas system lengths/barrel combos in my experience, so something is off here, especially since you tried it in a 20" and got the same results.
Did you try different mags?
I know some of my old CProducts mags won't lock back correctly, whereas others like Elander lock back fine.
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