Difference betweer HK Bolt Heads?

3178 Views 2 Replies 3 Participants Last post by JTinIN, Mar 1, 2012

bones0831

Discussion Starter · Mar 1, 2012

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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JTinIN

· #3 · Mar 1, 2012 (Edited)

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:
http://www.hkpro.com/forum/hk-nfa-talk/109906-mp5-k-bolt-f-differences.html
http://www.hkpro.com/forum/hk-nfa-talk/140017-mp-5-bolt-carrier-group-what-difference-better.html
http://www.hkpro.com/forum/hk-nfa-talk/116914-what-do-i-have-action-3-f-modified-bolt-head.html
http://www.hkpro.com/forum/hk-long-gun-talk/146056-how-tell-if-i-have-action-3-bolt-head.html (Note the correction to my post and the wider slot is F type)

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