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  2. StarFire (navigation system) - Wikipedia

    en.wikipedia.org/wiki/StarFire_(navigation_system)

    StarFire is a wide-area differential GPS developed by John Deere's NavCom and precision farming groups. StarFire broadcasts additional "correction information" over satellite L-band frequencies around the world, allowing a StarFire-equipped receiver to produce position measurements accurate to well under one meter, with typical accuracy over a 24-hour period being under 4.5 cm. StarFire is ...

  3. Rim (firearms) - Wikipedia

    en.wikipedia.org/wiki/Rim_(firearms)

    The lack of a projecting rim makes rimless cases feed very smoothly from box magazines, drum magazines, and belts. Rimless cases are not well suited to break-open and revolver actions, though in break-action firearms they can be used with appropriate modifications, such as a spring-loaded extractor/ejector or, in a revolver, a half or full moon ...

  4. Star Firestar M43 - Wikipedia

    en.wikipedia.org/wiki/Star_Firestar_M43

    The Star Firestar is a series of single-action semi-automatic pistol consisting of four models that received the 1991 Handgun of the Year Award from Guns & Ammo magazine. The Firestar was available in 9 mm Para (M-43), .40 S&W (M-40), and .45 ACP (M-45) calibers, all having a single-stack magazine. A double-stack 9mm version (M-243) was also ...

  5. Ballistics by the Inch - Wikipedia

    en.wikipedia.org/wiki/Ballistics_by_the_Inch

    In this case they tested a wide variety of ammunition available in .38 and .357 magnum using a single revolver modified to have a long barrel (so that they could cut it down an inch at a time, as they did with the barrel length tests) and also modified to allow them to change the gap using a set of shims. In this way they were able to test with ...

  6. Magazine (firearms) - Wikipedia

    en.wikipedia.org/wiki/Magazine_(firearms)

    Magpul has been granted a patent [47] for a STANAG-compatible casket magazine, [48] and such a magazine was also debuted by SureFire in December 2010, and is now sold as the MAG5-60 and MAG5-100 high capacity magazine (HCM) in 60 and 100 round capacities, respectively, in 5.56mm for AR-15 compatible with M4/M16/AR-15 variants and other firearms ...

  7. Internal ballistics - Wikipedia

    en.wikipedia.org/wiki/Internal_ballistics

    The barrel and mandrel are rotated and hammered by power hammers, which forms the inside of the barrel. This is the fastest and often cheapest method of making a barrel, but the equipment is expensive. Hammer-forged barrels are generally not capable of the accuracy attainable with the first two methods mentioned.

  8. Drum magazine - Wikipedia

    en.wikipedia.org/wiki/Drum_magazine

    A drum magazine is a type of high-capacity magazine for firearms. [1] Cylindrical in shape (similar to a drum), drum magazines store rounds in a spiral around the center of the magazine, facing the direction of the barrel. Drum magazines are contrasted with more common box-type magazines, which have a lower capacity and store rounds flat. [1]

  9. Feed ramp - Wikipedia

    en.wikipedia.org/wiki/Feed_ramp

    It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel. The feed ramp may be part of the magazine ( AR-7 ), part of the receiver or frame ( Mauser C96 ), part of the barrel ( H&K USP ) or part of the barrel nut/locking lugs ( AR-15 ).