This past weekend I took a low round count course with my MK18. Throughout the class I had no true stoppages with live fire, but a few times when I had to eject a live round from the chamber it was stuck in there pretty tightly. It wasn’t every single time, but the three times it occurred I had to lightly mortar the gun. I can’t quantify the force but it was barely more than the weight of the gun.
The ammo I was shooting was a handload of mine (62 gr FMJ, LC brass). Every single round passed a .223 chamber gauge as soon as it came off the press, and the 2 live rounds I recovered passed the gauge a second time (I could not locate the third round).
The upper is a factory stripped DD MK18 upper with a Toolcraft NIB BCG. I’m not sure if it matters, but the buffer is an A5H0 with a standard rifle spring (I’m pretty sure it’s a BCM spring but it could be Vltor too, can’t remember). I’m also running a LAW folder. I only mention it in case the extra momentum of a heavy buffer system somehow played a role, but I’m thinking that’s not the case because the rounds weren’t out of spec.
Thoughts? I always store the rifle muzzle down and lube it with SLIP2000, so I’m wondering if some lube ran off the BCG into the chamber and gummed it up just enough to make manual extraction difficult. Idk if that’s even a thing, so I thought I’d run it by you gents.
Could it be the BCG? Ik NIB has fallen out of favor due to wear patterns but this one only has a little over 1k rounds through it.
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