The following weapons appear in the video game Titanfall:
Pistols
"Hammond P2011"
The standard issue handgun in the game - seemingly based on the Springfield XD series of pistols as seen in its grip design and grip safety, while the segmented slide resembles an airsoft WE Tech Hi-CAPA 1911-based pistol.
"RE-45 Autopistol"
A presumably .45-caliber machine pistol also available from the start in the game, the "RE-45" shares the same Springfield XD-like grip of the "Hammond P2011" but has a longer frame and slide, as well as a compensator.
"Smart Pistol MK5"
Also available from the beginning of the game for the pilot loadouts is the "Smart Pistol MK5," though it is actually classified as a primary weapon. The "Smart Pistol" has the rather whimsical ability to lock onto targets (including multiples at one time) and fires self-guiding bullets. It also shares the Springfield XD-esque frame of the other pistols, but has its own unique slide assembly. As a primary weapon, it can also be upgraded with extended magazines, a suppressor, or an "Enhanced Targeting Module" that increases the size of its lock on crosshairs.
Submachine Guns, Assault Rifles, and Sniper Rifles
"R-97 Compact SMG"
The "R-97 Compact SMG" is an alleged submachinegun that features a high rate-of-fire and 40-round magazines by default. It resembles stylized AR-15 lower and upper receivers, featuring the same style of buffer tube, charging handle, ejection port, and magwell (albeit canted rearwards, a bit like modern pistol magazine lower receivers for AR-15 PCCs).
"C.A.R. SMG"
Unlocked at level 34 is the "C.A.R. SMG," the other submachinegun in the game. Its receiver resembles a mix of the rear half of Bushmaster ACR combined with front end of an FN SCAR-L, and seems to be a truncated version of the R-101 Carbine's receiver housing. It also has a short and enlarged TDI Vector-like magwell, and also features what appears to be a stylized AK-like railed handguard with a stylized Heckler & Koch MP7A1 folding foregrip.
"R-101C Carbine"
The default fully-automatic assault rifle of the game, the "R-101C Carbine" is one of the most common and used primary weapons of Titanfall, by both player and AI riflemen alike. It bears some design resemblances to the Bushmaster ACR and FN SCAR-L in its receiver, and also sports a very TDI Vector-like magwell.
"Longbow DMR Sniper"
A further development of the "R-101C" style rifle, the "Longbow DMR" is a similar rifle equipped with a different stock, a sniper scope, a presumed caliber-conversion, and features an unused vertical grip and bipod.
"Hemlok BF-R"
A fairly fictitious burst-firing assualt rifle, the "Hemlok BF-R" is unlocked at level 29. The weapon model does have a few real world components, such as an AR-15-like forward assist on the right side of the rifle, an AR-like magwell and magazine catch, and rather oddly, appears to feed from Heckler & Koch G3-like magazines that fit almost entirely into the magwell. The iron sights also resemble Magpul MBUS sights.
"G2A4 Rifle"
Unlocked at level 18 is the "G2A4 Rifle," a semi-automatic rifle that despite its name, heavily resembles an M14 in a JAE-100 G3 or ProMag Archangel chassis. The receiver is re-stylized and features a more rounded bolt and ambidextrous charging handles. It performs similarly to the Longbow DMR but with the tradeoff of less damage for usable iron sights and lower zoom scopes and increased base magazine sizes.
"Kraber-AP Sniper"
The final weapon unlock in the game, the "Kraber-AP Sniper" is a massive 14.5x114mm anti-material rifle adept at taking down man-sized targets in a single round and deals decent damage against Titans. It combines design elements from several firearms - namely, the left side-feeding magazine and bolt action are similar to the Mechem NTW-20, the stock and pistol grip resemble the Walther KK300 competition sporting rifle, and the side-stowed bipod resembles the Gepard GM6 Lynx.
Shotguns and Launchers
"EVA-8 Shotgun"
The lone shotgun available in the game is the "EVA-8 Shotgun," available from rank 5 when players unlock custom classes. It is a semi-automatic shotgun fed from detachable drum magazines (with a rather meager 6-round capacity; though this upgrades to 9 with the "Extended Magazine"), and despite being modeled with a left-side charging handle, apparently the shotgun rechambers from empty by pumping its forend. Its overall design somewhat resembles the Chinese QBS-09, with influences from tactical rail-equipped Saiga-12 or Fostech Origin-12 shotguns in regards to feeding from detachable drum magazines. Other upgrades include a suppressor or "Leadwall," which increases the pellet spread. The "Amped" burn card variation fires in full-auto.
"MAG Launcher"
The "MAG Launcher" is a belt-fed Anti-Titan grenade launcher unlocked at level 22 that fires grenades that can stick to metal opponents (namely enemy Titans and Spectres). Rather curiously, it seems to be made straight from a Kel-Tec KSG shotgun, converted into a belt-fed, break action system that fires ~20/25mm rounds. It is semi-automatic and feeds from a short 5-round belt; the amped version is fully-automatic with an increased fire rate and feeds from 8-shell belts.
"Sidewinder"
One of the two default Anti-Titan weapons available by default is the "Sidewinder" that fires 20mm rockets/high velocity grenades with shaped warheads intended mainly to damage enemy mechs. It has a somewhat similar barrel assembly and cutlass-pistol grip to the Heckler & Koch XM25 and it also is somewhat similar to the Denel PAW-20 Neopup/Ikunzi PAW.
"Triple Threat"
The final primary weapon unlock for Titans and the only one that has some resemblance to a real world firearm, the "Triple Threat" is a rotary grenade launcher that does resemble a Milkor MGL, albeit massively upscaled and somehow employs a cluster of three in-line barrels. As a result, it fires three shots in a horizontal spread of low velocity, spherical HE grenades on a delayed timer.
Miscellaneous stuff
Destiny Opening cinematic
Astronaut-white Mk 18 carbines are carried by the first fireteam (and first of mankind) that lands on Mars.