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  2. Barrel threads - Wikipedia

    en.wikipedia.org/wiki/Barrel_threads

    Using action threads to mount a barrel to a receiver typically requires fitting by a ... 21.59 mm diameter at the shoulder ... Older Glock 9×19mm, Galil (5.56 and 7. ...

  3. Muzzle brake - Wikipedia

    en.wikipedia.org/wiki/Muzzle_brake

    The concept of a muzzle brake had been experimented with for many years prior to its successful implementation: in 1922, a US Army Ordnance Department official stated in US Congress that "the muzzle brake was used in another form 20 years ago, and even longer ago than that, but it has never been successfully applied".

  4. Rail integration system - Wikipedia

    en.wikipedia.org/wiki/Rail_integration_system

    A rail system mounted on top of a SIG SG 550 A dovetail rail on a rifle receiver for mounting a sight. A rail integration system (RIS; also called a rail accessory system (RAS), rail interface system, rail system, mount, base, gun rail, or simply a rail [1]) is a generic term for any standardized attachment system for mounting firearm accessories via bar-like straight brackets (i.e. "rails ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Glock - Wikipedia

    en.wikipedia.org/wiki/Glock

    The concern with the size of the Glock 20/21 has been addressed by the Glock 36, 21SF, and 30SF, all of which featured reduced-size frames. The standard magazine capacity of the Glock 37 is 10 rounds. Glock 38: The Glock 38 is a .45 GAP version of the compact Glock 19. [136]

  7. Find out which of these must-see aquariums in the US are ...

    www.aol.com/must-see-aquariums-us-close...

    There is so much to see and learn at this Florida-based laboratory and aquarium. To start, you can see a whole host of magical marine creatures up close and personal, thanks to its 135,000-gallon ...

  8. US single-family housing starts surge; permits up slightly - AOL

    www.aol.com/news/us-single-family-housing-starts...

    WASHINGTON (Reuters) -U.S. single-family homebuilding rebounded in November as the drag from hurricanes faded, but the threat of tariffs on imported goods and potential labor shortages from mass ...

  9. Red dot sight - Wikipedia

    en.wikipedia.org/wiki/Red_dot_sight

    A red dot sight is a common classification [1] for a non-magnifying reflector (or reflex) sight that provides an illuminated red dot to the user as a point of aim. A standard design uses a red light-emitting diode (LED) at the focus of collimating optics , which generates a dot-style illuminated reticle that stays in alignment with the firearm ...