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Difference betweer HK Bolt Heads?

3178 Views 2 Replies 3 Participants Last post by  JTinIN
Can someone tell me the diferrence, as far as function, between the standard MP5/5K/SP 89 standard older flat face bolt head, the Action 3 Bolt Head, and the F Bolt Head? Does the difference have to do with what type of loads can be fired, or better extaction, or, just what is the difference between them? Thanks.
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The Action 3 bolt heads have a scalp cut on the front to help with feeding/ejection on certain rounds and are in general a little better option, being a later generation in product improvement.

A few links to reference threads: (Note the correction to my post and the wider slot is F type)
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