Quote:
Originally Posted by sherlockbonez
Sorry for the tread jack. I'm in simular situation. I was told by a trusted source that I do not need to replace the piston when I switch from a MP5 barrel to an M4, is this true?
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The piston is an unnecessary upgrade if all you're doing is an inner barrel swap. You only need to be concerned about the cylinder. In your case, no swap is required to go from an MP5-A or SD series to an M4 inner barrel)
Quote:
Originally Posted by The Saint
Hm, what do you think about cutting a Twist barrel? I don't know if crowning it would mess up the grooves.
Sherlock, you don't need to change the piston.
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Cutting it shouldn't be an issue. In stock form, they aren't even crowned (or crater-cut). If anything, they look like they have a flat cut and had the edges deburred with an interior deburring tool.