I'm getting some D-60s. I've loaded about 3K rounds this weekend. I plan on testing a drum 50x in a row to see what's what.
So to be clear, Vegas had mentioned to me that the original Max-11/15 would run 30 round mag after mag. On the other end, with Beta-C drums a standard direct impingement upper will run two Beta-C mags back to back. But if you put a third Beta-C in, the gas tube will fail before the third one is finished. The Melonite treated gas tubes last a little better than a standard gas tube. So I don't know how many 60 round drums in a row could be shot before the gas tube fails.
Scott
With my gas shut all the way off (clockwise until it stops) on my Odin gas block, I am still getting gas in my face with a suppressor. It does not fire unsuppressed all the way in. I just thought it would do better reducing gas - I cant tell much of a difference from fully closed and 5 clicks out with a suppressor. I am running it around 3 clicks out for both suppressed and unsuppressed use now.
With the gas block turned all the way closed, the gun should not cycle. At a minimum, it should short stroke.
Is it possible that the gas adjustment screw is locked in place and the clicks you feel are actually the hex inside the adjustment screw being rounded off? There is a set screw on the side of the gas block for adjusting the detente. If it is set too deep, the gas screw will not rotate. Another set screw is located on the back of the gas block to lock the first set screw in place. If you find out that you have rounded off the hex in the gas adjustment screw, we will send you a rebuild kit for the gas block that includes the adjustment screw, ball detente, spring and two set screws. No charge.
If you shot your upper a lot suppressed before trying to adjust the gas, it may have gotten carbon fouled and is preventing the screw from fully seating.
I recommend that you remove the handguard to access the gas block adjustment screws and remove the rear set screw first, then the side set screw, spring and ball detente. The ball detente is very tiny, try not to lose it. Then remove the adjustment screw and clean it of carbon. Then add a drop of oil on the threads of the adjustment screw and screw it in until it fully seats. Then unscrew it a little and re-screw it in a couple of times to see if it seats deeper. Re-assemble by installing the gas adjustment screw first, then drop in the ball detente and spring and install the set screw. While rotating the adjustment screw back and forth to feel the detente action, tighten the set screw until you can positively feel the detente click. Then tighten the set screw on the back of the gas block to lock it all in place. Screw in the adjustment screw until it fully seats, then back it off 8 clicks as a starting point for test firing and final gas adjustment to your specific ammo.
If you would like to, you can return the upper and we will do all of this for free.
What kind of accuracy are you guys getting with your 10/15s? I tried zeroing mine twice at 100y and I am unable to consistently hit a 6" circle. I attribute this to a combination of the poor trigger, open bolt design, and gas block touching the handguard - however I've shot an M240G and an M249 with better results so I'm not sure its the open bolt issue.
Just wondering what everyone else is getting