Pistol Grips& Gun Accessories

While there is some public perception that military-style semiautomatic rifles often see criminal use, a 2001 Justice Department study revealed that fewer than 2% of State and Federal inmates used, carried, or possessed a military-style semiautomatic gun or a fully automatic gun during their current offense [1]. Semi-automatic rifles are mistakenly believed to be capable of fully automatic fire or easily convertible to full-automatic functionality. While it is theoretically possible to convert almost a semi-automatic firearm to fully automatic, extensive equipment and machining knowledge would be required. The BATFE has specific design requirements for all firearms sold in the U.S. in order to ensure that they are not readily convertible. For example, the internal lower receiver of civilian AR-15 rifles is milled differently and has a much smaller cavity than that of the military-issue M16, and M16 parts such as the fire-control group cannot fit in a civilian rifle without extensive machining. The small number of automatic weapons confiscated from criminals are weapons smuggled illegally into the country, rather than converted semi-automatic weapons[citation needed].

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AR15 One-Piece Mounts
Here's the Big List of AR15 one-piece mounts. I'm always interested in reviews and experiences ... They use Torx-Plus screws, and include a wrench and spare screws.