Star Wars: The Original Trilogy
The original trilogy of the Star Wars saga consists of three films: 1977's Episode IV: A New Hope, 1980's Episode V: The Empire Strikes Back and 1983's Episode VI: Return of the Jedi.
The following lists the weapons used in the original trilogy of the Star Wars saga:
DDC Defender and SC X-30 Blaster Pistols (Vostok Margolin .22LR target pistol)
In the early scenes of A New Hope and in a few scenes in Return of the Jedi, Princess Leia (Carrie Fisher) can be seen with a "Drearian Defense Conglomerate Defender sporting blaster pistol" and "SoroSuub Corporation X-30 "Lancer" target blast pistol", respectively. They are both actually a Vostok Margolin .22LR target pistol, with some muzzle attachment fitted, selected for its diminutive size, keeping the prop gun from looking too bulky and unwieldy in Fisher's petite hands. Among other details, the X-30 in Return of the Jedi version lacks the commercially available compensator that the A New Hope prop had, attributed in-universe to the X-30 being a smaller more compact version of the Defender. Luke also briefly carries the Defender during the ceremony at the end of A New Hope.
BlasTech DH-17 Blaster Pistol
One of the weapons utilized by the Rebels in the films is the "BlasTech DH-17 blaster pistol". These blasters are first seen in A New Hope used by Rebel troops against Stormtroopers on the blockade runner Tantive IV and are later seen being carried by guards and officers on the Death Star. These were nonfunctional props with the receiver and pistol grip based on casts from a Sterling SMG (hence the larger trigger guards) and a (back then) distinctive looking Singlepoint OEG (Occluded Eye Gunsight) attached. Consequently, the muzzle flashes were added in post-production. There is an interesting continuity error where a couple of Imperial guards start off carrying this weapon but then switch to the E-11, firing it one handed like a pistol no less. This is perhaps because they looked similar enough and blanks provided a better reference point for adding blaster effects later.
In The Empire Strike Back, it is the weapon of a few Rebel soldiers on Hoth and a couple of guards on Darth Vader's Super Star Destroyer. For the film, the DH-17s were made from real Sterlings and were usable props that could actually fire. Despite the prop upgrade, the weapon had very little overall screen time during the film.
BlasTech SE-14C Blaster Pistol (Rexim-Favor Mk5)
The "BlasTech SE-14C blaster pistol" is carried by Dr. Evazan in A New Hope, who draws his weapon after provoking a fight with Luke Skywalker at the Mos Eisley cantina. It was built from a Swiss Rexim-Favor Mk5 submachine gun with the stock, barrel, and magazine removed and two ASI 4x20 scopes attached. A similar weapon, the "BlasTech SE-14r light repeating blaster" is also seen being wielded by Stormtroopers in publicity photos for A New Hope, but does not actually appear in the films.
General Lando Calrissian's Blaster Pistol
BlasTech DT-12 Heavy Blaster Pistol
In A New Hope, Greedo carries a BlasTech DT-12 during his confrontation with Han Solo where he may or may not have failed to shoot first. The pistol is a Ruger Mk I modified with a short barrel, finned flash hider, slightly modified grips, and several apparently targeting-related devices.
BlasTech E-11 Blaster Rifle (Sterling L2A3)
The "BlasTech E-11 blaster rifle" is the standard issue blaster rifle of the Imperial Stormtroopers. The E-11 props were built from the British-made Sterling L2A3 submachine gun (provided by Bapty & Co.). Numerous main characters, including Princess Leia (Carrie Fisher), Luke Skywalker (Mark Hamill), and Han Solo (Harrison Ford) use the weapon. Lando Calrissian (Billy Dee Williams) also uses an E-11 blaster in The Empire Strikes Back. Some details differ between the three movies, most notably the method of scope attachment and battery pack beside it (or lack thereof).
A revealing mistake is that spent cartridge cases can be seen ejecting from this "blaster" rifle. It is most noticeable in the bridge swing scene of A New Hope and when Lando is firing at Stormtroopers in The Empire Strikes Back. In Return of the Jedi the hero props were built from MGC Sterling replicas, explaining why there were no blanks used as in the previous two films.
BlasTech A295 and A280 Blaster Rifles
The "BlasTech A295 blaster rifle" and "BlasTech A280 blaster rifle" are the standard issue blasters of the Rebel Alliance ground forces in The Empire Strikes Back and Return of the Jedi, respectively. Both the A295 and A280 props were cast from replicas similar to (built from) both the World War 2-era German Sturmgewehr 44 (the A295) and from the M16 series rifles (the A280).
BlasTech DLT-19 Heavy Blaster Rifle (MG34)
The "BlasTech DLT-19 heavy blaster rifle" is the standard issue heavy blaster of the Imperial Stormtroopers. The DLT-19s were nothing more than World War II German MG34 general purpose machine guns painted solid black with added "rails" on the barrel shroud (like the E-11).
BlasTech T-21 Light Repeating Blaster (Lewis Gun)
The "BlasTech T-21 light repeating blaster" seen carried by the Sandtrooper Officer in A New Hope is a British Lewis light machine gun with its drum magazine removed and other minor cosmetic alterations.
RT-97C Heavy Blaster Rifle (MG15)
Imperial Sandtroopers can be seen carrying "RT-97C heavy blaster rifles" while on patrol on Tatooine in A New Hope. The RT-97C prop is in fact a modified German MG15 machine gun. Notably, until the release of Star Wars Blueprints: The Ultimate Collection in 2008, the weapon did not have an official designation, and had been simply referred to as the "MG-15" by fans. The name references Chris Reiff and Chris Trevas, the artists of the blueprints, and the year they first met - R(eiff)T(revas)-(19)97C(hris).
BlasTech DL-44 Heavy Blaster Pistol (Mauser C96)
The "BlasTech DL-44 heavy blaster pistol" is the weapon of choice for Han Solo (Harrison Ford) and the Rebel Alliance. The weapon is also seen been wielded by Luke Skywalker (Mark Hamill) throughout The Empire Strikes Back. Possibly the best known duplicate of a real gun, the DL-44 blaster pistol prop was built from a Mauser C96 handgun with an added right-side mounted pistol scope. The modifications are obviously added on to the exterior, though the distinct "broomhandle" grips are still wooden.
The live-fire C96 used in Star Wars was previously used in The Naked Runner, where it also had a scope mounted to it, although the lower body was replaced. The scope and mount actually used in Star Wars were previously used in Sitting Target, where it was mounted to a Mauser M712 Schnellfeuer machine pistol.
Ion Blaster (Cut-down Lee-Enfield No.1 MkIII)
The "ion blaster" utilized by the Jawas who shoot R2-D2 in A New Hope were built from a cut-down British Lee-Enfield No.1 MkIII* series bolt-action rifle with the grenade launcher cup attached to the shortened barrel.
EE-3 Carbine Rifle (Webley & Scott Flare Gun)
The "EE-3 carbine rifle" (modeled after the E-11 in-universe), a modified Webley & Scott No.1 Mark 1 Flare Gun, is used by Boba Fett in The Empire Strikes Back and Return of the Jedi. In The Empire Strikes Back the barrel was rather simple looking, but in Return of the Jedi, it has a more distinctive barrel and the scope is actually mounted backwards to where it was before!
Dressellian Projectile Rifle (Mauser Kar98k)
An unmodified Mauser Kar98k bolt-action rifle as the "Dressellian projectile rifle" is seen in the hands of the character Orrimaarko (a.k.a. "Prune Face") in promotional photos for Return Of The Jedi.