I agree that if factory ammo was used, then that’s not the cause.
I’m surprised that Geissele didn’t provide an RMA, since it’s a factory gun that hasn’t been modified. It shouldn’t take long to perform a lock-back test, and if it fails, then that’s all Geissele should need to know. Swapping the DD bolt carrier group would be an easy test.
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I’d also think is NOT the ammo…. It’s factory ammo and had NO issues when I ran on the 1st the run…. I will do a lock/back test soon I can.
Thanks
Geissele's product page indicates that the gas block is pinned (bombproof installation), so I'm comfortable stating that a gas block mis-alignment didn't occur after it was in your posession.
Factory from say federal or hornady…or factory from say freedom/lax? Have you at least tried different ammo since this incident…to rule that out? That is your easiest option, do these in the following order:
1. Look into upper receiver and check to make sure the gas tube isn’t damaged/obstructed, post a pic if need be
2. Take your handguard off and post pic of gas block, check to see if loose
3. Try different ammo to simply rule it out
4. Try different bolt carrier group (yes your daniel defense is fine)
What state are you in? Perhaps someone can recommend armorer or gun store if you have difficulty with anything above.
Thanks “sidewaysil80…. I will do the following your recommendation 1,3, 4 soon. I’m not going take off the handrail til the geissele tech guy said “okay”…. I’m in the PNW(Oregon)
Identify the problem by isolating variables.
Changing only one at a time.
Bolt, ammo, mags, gas system.
If I understand your explanation correctly, my mk18 would do something similar, unsuppressed with Barnaul, so my guess is ammo (since you still can’t say what you’re using) or the gas system.
As long as your troubleshooting skills are better than your grammar. If not, at least make sure it’s not mags or ammo and just ask for an RMA and let them sort out.
Ha! Can’t wait for an RMA!!
Dan1612…. How did you fix or solved your issue with MK18??
To run crap steel case lacquered ammo in a 0.070 unsuppressed Mk18 with a carbine spring and H2 buffer, you can drop the buffer weight to compensate for the lack of pressure, or you can suppress it, or run the type of ammo it was designed to run (mil 556).
Wait. You’ve got a 0.068 gas port with a Super 42 H3. I demand to know what kind of ammo you’re running. Watch it be PMC bronze. Lol
Last edited by dan1612; 09-17-21 at 22:04.
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