CPM M4 is still a well-regarded high carbon tool steel steel. The M4 RSK Mk1's were a limited run, so don't foresee doing more in M4, even though we get a lot of requests.
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Doug Ritter
Editor
Equipped To SurviveŽ
Chairman & Executive Director
Equipped To Survive Foundation
www.KnifeRights.org
www.DougRitter.com