I have both Harris and RCBS bipods for my AR's. The Harris is for mounting to the swivel stud and the RCBS for rail mount. Both work well. Good info in previous post re free floating barrels. POI will be affected in non-floated barrels depending on where bipod is attached.
You may want to consider a mono pod or a shooting bag to add stability to the butt. This will provide a very stable platform for long range shooting.
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"Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded" - F.A. Hayek
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