Semi Auto Bolt Carrier - 9mm - USC, UMP - $349.95
Semi Auto Bolt Carrier - 45 - USC, UMP - $349.95
Bolt Group - UMP .45 - $369.95
Semi Auto Bolt - 9mm - UMP - $369.95
Semi Auto Bolt Group - UMP .40 - $369.95
In stock and ready to ship today.
QUESTION- Is there any bolt carrier wear that would affect head spacing?
While the gap is measured from the front of the carrier, basicly the head spacing wear comes from the rollers which can be replaced and not from wear on the carrier.
Head spacing is determined by "using feeler guages...