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I built a pistol using the OA93 upper but I used a RRA lower. My OA93 upper came with a pigtail gas tube and it usually functions fine, not perfectly fine, but fine, as I consider it nothing more than a cool toy. I've noticed that my recoil spring seems pretty stiff, also.
I would love to find a replacement, as I want to begin construction on a 9mm OA93 upper to match. Let us know if you if you find that spring anywhere. Thanks.
J
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