A Nudelman-Suranov NS-23 autocannon with 150 rounds was fixed on the lower starboard side of the nose; it was fired by the pilot who had a primitive ring sight to use for aiming.
22.
Unlike Model 500 and 590 shotguns ( with the exception of ghost-ring sight 590 models ), Model 590A1 shotguns cannot be easily fitted with the common factory 500 heat shield, due to the heavier barrel.
23.
The extreme case of this is the ghost ring sight, a relatively recent innovation that may be the fastest type of iron sight to use, while still providing a degree of precision comparable to or better than most open sights.
24.
Slug rounds, if available, can extend the effective range of the shotgun to 100 meters ( although this is also dependent on the shotgun's sighting system; rifle sights and ghost ring sights will allow the average shooter to effectively engage human-sized targets at considerably greater distances than with a bead sight ).
25.
During the Mk III's life there were a large number of almost continuous improvements made, including the ASV Mk IIIA and four more machine guns in a fixed position in the wall of the forward fuselage just behind the turret ( developed on RAAF aircraft first ) with a simple bead and ring sight for the pilot.
26.
The BPD SWAT team uses both the Colt model LE6933 M-4 Commando and model LE6921 M-4 Carbine in 5.56 mm with both Trijicon RX30-14 Reflex and TA01NSN ACOG sights and SureFire M900A vertical foregrip weapon lights with one weapon issued with an M203 40 mm grenade launcher for less-lethal ordnance, Benelli M4 Tactical Entry 12-gauge semi-auto shotgun with ghost ring sights and SureFire handle mounted tactical lights, a Remington model 870 12-gauge pump shotgun for entry \ less-lethal ordnance and a Penn Arms L8-40 fixed stock 40mm multi-launcher Riot gun firing rubber, wood, or riot-control agents.
