Shot this last Sunday---if there wasn't snow all over the ground, I'd be shooting it again today.
The 5.7x28 upper is installed on a Bushmaster lower, with the special 57 buffer in the tube----the 57 is a blowback system and requires a heavier buffer, (the one for the rifle tube is a special order item from 57 Center).
Function was flwless through 50 rounds and then my fingers froze.
Accuracy was good, but this was my first session with an EO Tech, so I didn't get any keeper targets.
Next time.Information
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