As an update, I recently purchased a Geissele Super Charging Handle. It runs flawlessly in my CMMG Mk9T. So in addition to the PRI 9 mm handle, std handle, the Geissele appears to work. The BCM Mod 4 (non-ambi) is still a no go, but the same handle works fine in my 5.56 mm ARs. I am still mystified.
My Colt came with the standard charging handle, and I never saw any reason to change it.
We are reinventing the wheel here... What problem are we trying to solve?
Moon
Here is mine. I converted an Aero Precision upper to a left hand active charger.
Need a mag well vice block for your Colt or Glock AR-9? I am your guy.
When I built my 9mm AR, I bought a complete CMMG Upper. It has worked as delivered flawlessly. The only problem I had when I first started using it was the coating on the ASC mags. Once I buffed the coating off the feed lips, the gun has run like a Swiss Watch. The magazines are Stainless Steel, so no worries for rust. I hope this helps.
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