Prime CNC Upper Receiver for Systema PTW

This arrived late last week – fully sick! Prime CNC’ed goodness…

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Quick notes on fitment:

  • Systema charging handle fit.
  • Systema dust cover & pin fit, though upper corners of dust cover were a bit tight.
  • Systema black and silver cylinders fit a little tighter than in Systema upper, though not overly so.
  • Systema steel 14.5″ outer barrel fit, though the diameter of the chamber seemed slightly smaller than the hole in the receiver by a fraction of a MM – Systema upper fit slightly better.
  • Systema barrel nut was harder to install, some chasing of the threads was required to complete it.
  • Buffer tube cap on my lower requires reshimming after installation of Prime upper.
  • Minor play between Prime upper and Systema lower – about the same as the Systema upper I had before.

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Amidst the bubble wrap, I dug out these two bags from the box.

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Very clean cut.

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Nice matte finish. Seems durable enough – doesn’t scratch off easily. Might be cause of issue of tight barrel nut threads and tight cylinder fitment.

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Note: Systema OEM dust cover fit well, but the corners did dig a little bit into the corners outside of the Prime ejection port.

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Heck, even the dummy forward assist looks nice.

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Systema OEM outer barrel has fractionally small play in it without barrel nut being secured in place, not present in Systema upper.

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Mmmm, machine marks…

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Systema charging handle, as well as black and silver cylinders fit well. Cylinders were a little bit tighter than the fit in my old Systema upper – nothing worrisome to me though. Less slop can’t be a bad thing.

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