.17 HMR Trigger Function Notice
As currently designed, our .17 HMR rifle is balanced to operate properly with a full-weight hammer and full-weight hammer spring typical of the stock semi-automatic parts. Specifically, this includes the round-top hammer profile and not the earlier notched front profile.
Therefore, target-style fire control groups - specifically those with reduced hammer weight and reduced hammer spring weight - typically will not be suitable as the increased bolt speed will create a number of reliability issues.
For those wishing to reduce the trigger pull weight for the .17 HMR rifle, it is possible to substitute either the Alexander Arms or the Geissele SSA trigger groups with the addition of the aftermarket heavy buffer unit now available on our web site. We hope to be able to recommend alternative fire control groups in the future, as time permits for reliability testing.
Again, we would like to emphasize that using alternative fire control groups without properly balancing the gun through the installation of heavy buffer units will lead to function problems.
Please feel free to contact us if you have any questions in this matter. We are happy to provide assistance.