Have an old match MP5 who's bolt gap is nearing .25mm (at .28mm)
It's probably got 10k rounds through it AFTER I got it and it was in poor condition.
I added +8 rollers to it and the gap is now at 0.38mm but the rollers don't slide into the locked or out of the locked position without a bit...
With Coharie Bolt - .017" (.43mm)
With HK Bolt - .027 (.70mm)
Why would the hk Bolt be so high? -4 rollers would bring it down, but would there be any other problems since the original gap was so high?
The hk bolt is brand new. Just curious to see what factors could contribute to the...