I have the maglock\kingpin setup on my semi pistol AR and it's hit and miss depending on your setup. All tolerances are different depending on fit of the upper and lower with the bolt. At a certain point the ARmaglock might even look illegal because the splitting of the reciever doesn't actually stop the bolt which may or may not be a requirement...
My 556 upper bolt holds back but the 9mm bolt is 50.50. The way these systems work the bolt hold is just barely making contact with the bolt and a slight movement will drop it forcing a manual bolt reset if it drops before insertion of a fresh mag. You won't really know how well or crappy it will work or if it's even tweakable until you install it on your rifle.
My 556 upper bolt holds back but the 9mm bolt is 50.50. The way these systems work the bolt hold is just barely making contact with the bolt and a slight movement will drop it forcing a manual bolt reset if it drops before insertion of a fresh mag. You won't really know how well or crappy it will work or if it's even tweakable until you install it on your rifle.

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