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Old January 10, 2009, 04:18 AM   #13
David Hineline
Senior Member
 
Join Date: December 23, 1999
Location: South Sioux City, Nebraska
Posts: 704
There is a trip surface on the factory HK semi auto guns that was ground off, this surface can be welded back on or a machine gun bolt carrier can be dropped in.

Also different caliber guns had different ejectors and hammer springs in the trigger pack so when you move the trigger pack from say a 9mm to a .223 to a .308 then the ejector needs be swapped out.
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