AR-15/M16 Gas Piston Conversion Kit Primer Download
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While the base starting point of the Whisper and others was the .221, the best way to get it is as factory brass. No need to cut and re-form your own brass.
This photo gallery is excerpted from the new book by Patrick Sweeney, Gun Digest Book of the AR-15, Volume 4. Click here to order this in-depth AR-15 book for only $19.39 (that's $10 off retail).