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USR™ FORGED UPPER STANDARD RECEIVER
Original price was: $111.99.$71.10Current price is: $71.10.
Description
The USR™ Upper Standard Receiver is a precision machined upper with a special proprietary bore that is ultra smooth with a roughness average in micro inches of 16, as opposed to standard bored or milled uppers that are 32-63, or higher. This reduces bolt carrier friction and creates a much smoother operation.Barrel nut threads, bore and barrel extension surfaces are all machined in one operation so that they are perfectly concentric and perpendicular to the barrel and fixing assembly.
Specification:
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