+- 6.5 Grendel Forum (https://65grendel.com)
+-- Forum: 6.5 GRENDEL DISCUSSION FORUMS (https://65grendel.com/forumdisplay.php?fid=3)
+--- Forum: 6.5 Grendel Troubleshooting (https://65grendel.com/forumdisplay.php?fid=15)
+--- Thread: Short-stroking with 90gr TNT, fixed with gas port work (/showthread.php?tid=24550)
Pages:
1
2
Short-stroking with 90gr TNT, fixed with gas port work - chatterbox - 01-28-2023
Not always true. My pile of empties landed in the "undergassed 5:30 zone" and cycling was horrible. At first the installation of the Superlative Arms adjustable gas block, at 4.5 turns out, did nothing to help the cycling. In desperation I kept turning out the adjuster eight clicks at a time, which was purported to be closing the port, and at 10 clicks from maximum adjustment the cycling smoothed out and the empties were landing at the 4:00 position. That is opposite of the instructions, but was I ever glad to solve that year long cycling problem. Oh, I did check the position of the gas block by .025" feeler gauge and it was perfect, or at least it was after I adjusted it, but it still wouldn't cycle. It was the backing off the adjuster nearly to maximum that solved the problem.
Oh, a local gunsmith said that, contrary to intuition, the Grendel with a 24" barrel is often undergassed compared to a 5.56, because the gas tube is so long. More volume = less pressure.