Here's a site I just discovered yesterday that discusses all manner of Trek related toys, all series, all decades since its inception.
I'm not knowledgeable enough to debate his authority, so I just perused it for the nostalgic romp that no one can really argue. He covers the Remco and AHI bargin toys of the 70s, so that should cover the meat of this topic.
He apparently loves the Remco "electronic" phaser, stating it existed during an era when kids didn't care that much about screen accuracy. Uh, maybe he didn't, but I, just a brat of 12 years when it was released did care. Ugh, I found the thing horrendous! It was based upon the awkward proportions of the AMT kit, except, "inflated". I could have forgiven that if, IF the audio circuit had produced something, anything akin to the famous cicada-like shriek originally created for George Pal's "War of the Worlds". Instead...it "chirped"! I honestly think the company used a circuit originally meant for a kind of "robotic" birdcage display because it sounded NOTHING like a phaser! The circuit would have better served the flip-lid of a communicator toy. Except, the circuit board of the time could barely have fit within a tricorder housing, let alone a pocket shaver sized comm' casing.
Here's the toy in question.
I was not thrilled with that purchase.