...guess I'll weigh in here. Yea, it sure looks a lot like a pylon and some sort of item, store, or ejector rack – albeit a primitive sculpt if it's from a kit. That's what I'm going to guess…a crude repro of a multiple ejector rack.
Judging by the pylon, maybe I can help narrow your search (considering a few airframes produced before ESB that might have been in kit form)
1st: What might be worth some research:
F-105 (inner wing pylon), B-52 (external ejector rack - conventional bombs), Hawker Hunter, Tu-16 ...or searching for ALQ-101 or 119 ECM pods (doubtful), Multiple Ejector Rack (MERs), or cruise missiles.
2nd: What it most certainly is not (based on the pylon shape):
A1 Skyraider, A3 Skywarrior, A5 Vigilante, A-6 Intruder, EA-6B, F-4, F-5, F-14, F-15, F-16, F/A-18, T-38, F-84, F-86, F-100, F-101, F-102, F-106, MiG-15, MiG-17, MiG-19, MiG-23, MiG-25, MiG-27, Buccaneer, Mi-24 Hind, Su-7, Su-15, Su-17, Su-22, AH-1, AH-64, F4D Skyray
Then again, which of these aircraft would be in a position to carry such an item on a particular station should be considered. The '105 stands out because of the use of ECM pods and different racks in the Vietnam War, where the Hunter could stand out because it's a British airplane that could have been easily obtained by prop builders in the UK *Fett history buffs: comment here* that could also carry ECM pods and air-to-ground ordnance.
Then again who knows….it might as well be a part from some car model along with the leaf-spring-lookin'-thing in the bottom photo 
(for everyone, the part under discussion is on the blaster's right side half-way between the scope and the trigger finger). Ok, that's my 100 cents. whew.
