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Reflector sights as aircraft gun-sights have many advantages. The pilot/gunner need not position their head to align the sight line precisely as they did in two-point mechanical sights, head position is only limited to that determined by the optics in the collimator, mostly by the diameter of the collimator lens.
F27 Sights, rocking-bar (all types) – Parts and equipment; F28 Sight, M1901 (French) F29 Sight, M1916, for 75 mm Gun M1916 – Parts and equipment; F30 Sight, telescopic, 2.24-inch (6 Pdr.) tank gun, Mk.II (British) -Parts and equipment; F31 Sight, M1916, telescopic, 37mm gun, M1916 – Parts and equipment, 18 October 1926
The Mark III was made of 48 parts, compared to the Mark II's 69, but the Mark II remained more commonplace for logistical reasons – parts between the two were not interchangeable. [17] Though slightly lighter, the magazine well was fixed in place, and the barrel could not be removed, meaning if it was damaged the weapon had to be scrapped.
Norden proposed removing the electrical switches used to move the pointer and using the entire bombsight itself as the indicator. In place of the thin metal wires that formed the sights on the Mark III, a small low-power telescope would be used in its place. The bombardier would rotate the telescope left or right to follow the target.
In addition, under US gun law, a receiver that is legally a machine gun cannot legally become semi-automatic. [4] There is no federal restriction on the purchase and import of machine gun parts kits (minus the barrel), however. [3] Parts kits are available for many firearms including the AR-15 and AKM variants. [5] [6] [7]
The Martini–Enfield Mk I was a Martini–Henry Mk III rebarrelled to .303 and with a new extractor installed, whilst the Martini–Enfield Mk II rifles were generally of new manufacture, although there are examples of converted Mk II rifles.
The Mark VII loading used a 174 gr (11.28 g) pointed bullet with a flat-base. The .303 British Mark VII cartridge was loaded with 37 gr (2.40 g) of Cordite MDT 5-2 (cordite MD pressed into tubes) and had a muzzle velocity of 2,440 ft/s (744 m/s) and a maximum range of approximately 3,000 yd (2,700 m).
A Leupold telescopic sight mounted on a dovetailed rifle receiver via two scope rings From left: A sketch of a cross section on a Zeiss rail and ring mount, both with a Picatinny rail interface. Scope mounts are rigid implements used to attach (typically) a telescopic sight or other types of optical sights onto a firearm .