Short-stroking with 90gr TNT, fixed with gas port work

[Harpoon1]

[ragrendel]

Good to hear and thanks for the updates! Learn a lot from this forum.

[LRRPF52]

[Harpoon1]

[grayfox]

Harpoon I can roger that on the BA... except for me it was for 2 18" BA 223 wylde barrels. Went up your 1-size drill bit (I got a wire gage set of them in order to do a more finely tuned 1-up), that fixed their short stroking just like you saw here with your barrel.

[chatterbox]

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.