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ZRO Hardguard System

Steel Dowel Pin Precision Interface between HG and Receiver.

Works with SLR Receivers with ZRO locking hole. (Available Feb 1 2023)

We now will offer a FREE service to drill any AR15 Upper receiver to receive the ZRO dowel pin.

Send us your stripped receiver AND a return label. We will drill upper and return to you.

ZRO Series

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