ive seen laserblast and the redeemer
laserblast is an old sci fi movie about a kid that finds a laser rifle (alien) he fuses with it and it turns him in to an alien/monster has roddy mcdowell in it (was released by intervision in the early 80sin the uk now defunct)
the redeemer (aka redeemer son of satan)was released by derann video in the early 80s in the uk now defunct,basically a pretty good friday the 13th type stalk and slash movie based around a high school reunion 🙂