Have a HCS Mk12Mod1 and the bolt stays open after the last round until I put the suppressor on it. No gas leaks, everything is in very good shape and this has the low profile Crane gas block which is not adjustable.
I tried various different mags, PMAGS, metal, USGI with about 80%+ of the time it not staying open.
Is this something as simple as needing a heavier buffer due to the gas in the system moving things faster, and not allowing it that fraction of a second to catch and lock? I'm uncertain which buffer I have now (HCS site doesn't mention anything about it) but wanted to see if this could be fixed with a H3 buffer.
I tried various different mags, PMAGS, metal, USGI with about 80%+ of the time it not staying open.
Is this something as simple as needing a heavier buffer due to the gas in the system moving things faster, and not allowing it that fraction of a second to catch and lock? I'm uncertain which buffer I have now (HCS site doesn't mention anything about it) but wanted to see if this could be fixed with a H3 buffer.