AR-15/M16 Gas Piston Conversion Kit Primer Download
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AAC 7 Whisper
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The barrels you can get in .300 (either type) will have fast twists. Where a .308 Winchester would have a 1/10 twist, the 300 AAC 7 Whisper have 1/8, 1/7.5 or 1/7 twists.
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).