The XM63 is a heavy AM Rifle made by Phoenix Precision Firearms, a US-based weapons manufacturer. It is designed to replace the M107, a rifle that is currently in service with the US Military. Its most prominent feature is the use of 4 experimental electromagnetic rails that accelerate the round going out of the barrel to a higher speed. The rifle as it is shown in the picture below lacks its signature accumulator (used to power the rails), and as such cannot use the rails. This accumulator, usually strapped to the back of the Sniper's suit, is quite heavy and needs to be recharged every 2 days or so of sniping. The stock contains a recoil containment spring system - after each shot, the barrel is allowed to travel back through the rifle's body while the springs make sure it gets back firmly into place in a second's time. Unlike the M16's infamous plastic stock, this one is made out of metal, adding further weight onto the already heavy gun. Another prominent feature is the XM63's unique scope - using the rifle's on-board anemometer, it calculates the approximate spot that the bullet will strike. It also calculates the bullet's internal energy (and therefore penetration power) by the time it reaches the marked target. Another variation is the XM63tac Tactical Anti-Personnel rifle, a shorter and lighter rifle chambered in .338 Lapua.
XM63 Anti-Materiel Rifle
The XM63...
...And its little brother, the XM63tac.
Statistics
Name : XM63
Weight : 13 kg (unloaded), 14.4 kg (loaded)
Length : 40" (80 cm)Barrel Length : 24" (22" on the XM63tac)
Muzzle Velocity : 850-1500 m/s (XM63), 1000-1800 m/s (XM63tac)
Maximum Range : 3XXX meters
Optimal Range : 800-1500 meters
Rate of Fire : Semi-Auto, no more than 20 RPM due to magnetic build-up and recoil consumption
Modifications
Experimental Nano-Anemometer
Variable-zoom scope with "estimated point of impact" crosshair in addition to normal one.
Magnetic Accelerators
Thermal Vision for the scope to find targets behind obstructions
Overall
Accuracy : Extreme
Recoil : Low
Damage : Unwithstandable
Mobility : Cumbersome
Reload Speed : Medium
Penetration : Destructive
Ammunition
While the CEO of Phoenix Firearms initially wanted to go with basic .50BMG/.338 Lapua Magnum cartridges, the general inability of those rounds to withstand such speed forced him to change up the game. Thus the .50VAM (Velocity Anti-Materiel, 12.7x109) and the .338VAP (Velocity Anti-Personnel, 8.58x77) cartridges were created. Their primary usage is to be compatible with the huge energy they were given at launch, but still be shootable in case the rails are turned off for any reason such as low power or physical deformation. .50VAM rounds are equipped with tungsten penetrators (Minus the civilian versions of the ammunition) and have a much sharper nose than .50BMG and similar high-cal projectiles. The penetrators cover the front side of the bullet and disintegrate into 4 pieces that continue channeling through the building/vehicle, while the explosive charge of the round, locaned behind the penetrator, gets exposed and produces a small explosion powerful enough to injure the vehicle's passengers even if neither they nor the vehicle's engine were directly hit. The .338 bullets, on the other hand, are seldom equipped with penetrators and are often shot with high-grain loads instead. This is due to the fact that future infantry suits are usually designed to minimize penetration, but nobody ever thought that there's a type of bullet that can destroy a person's ribcage, and those heavy .338 loads are designed to do just that.
