Hello, sorry for the delayed reply but to answer your question, the medium covers will not work on a Rifle suppressor. You'll need a 6.75" x 1.5" Custom Heavy Cover for the Surefire SOCOM 762 Mini 2. Please refer to the size chart on the heavy cover page or on the Burn Proof Gear website size chart in the future.
There is a Burn Proof Gear Suppressor Cover that will fit the Dead Air Mask but it is a light custom model which will have to be ordered through Burn Proof Gear.
The Burn Proof Gear Suppressor Cover will work for the Dead Air Sandman L. However, you will need the heavy model located at the link below.
https://www.opticsplanet.com/burn-proof-gear-suppressor-cover-heavy.html?_iv_size=9-in
I am not finding any Gemtech suppressors that are oddly shaped. If you are referring to the Gemtech One, it is 7.75x1.625" and the widest one of these covers is 1.5", so no, it would not fit.
The Helix is 7.2x1.6", these will not work. According to the manufacturer: Measure the LENGTH you want covered and ADD 0.5″
Heavy Covers will only fit 1.5″ DIAMETER suppressors. If your rifle suppressor is not between 5″ – 8.5″ in length, and exactly 1.5″ in diameter, you may need to order a CUSTOM cover.
These would be too narrow.
Yes, this suppressor cover will fit that suppressor. You'd want the 8" covers.