Semi auto rifle hosts are hard pressed to come in under 140 regardless of can. A Stoner gas AR that has gas system adjustment is about the only platform that will, and not by much. All the rest are typically mid 140s into 150s. FAL, M1A, AK, and all the other op rod guns are pretty loud at shooters ear even when tuned. Still worth suppressing, but not OK for naked ears.
As such, I generally run smaller cans on them, since there's no point in 120s dB muzzle end suppression from an 8" or longer critter when you'll still be at least high 130s at ear.
Handgun hosts and hunting rifles are another where shorter & lighter sometimes outweighs maximum suppression. I love the way our 8" long Phoenix IX performs on 9mms, but when I'm actually toting one around and shooting less/very little, I'll use our 4.3", 3 ounce Canine that's just barely tolerable when dry. Likewise, our 9" Accipiter on my .25-06 sounds amazing, but walking through the woods, I prefer a couple inches shorter and a good bit lighter, despite higher sound pressure, because I'm likely only gonna fire one or two rounds, if at all.
As much as I'd like to get into the suppressed realm, paying $500 for a can that appears to be worth all of $50 causes my pause.
We could build $50 cans. And you'd get exactly what you paid for: Garbage. These things are a lifetime investment in the US, so a "buy once, cry once" outlook is prudent.
The only way you can get a halfway decent can for $50 is to machine it yourself with material you scored on the cheap. Even our shortest rifle can has more than $50 worth of 17-4 PH stainless bar stock in it at today's material prices, and 17-4 is far from being the most expensive suppressor material. Price out Inconel 718 or Cobalt 6 lately? Then there's all the other aspects of precision manufacturing. I pay more for consumable carbide drills and inserts in a year than most people pay for a new car, and I'm a small outfit. A single tool holder for my Mazak Integrex 200SY, a half million dollar machine, averages $800, go as high as $1,300. The turret milling heads for my SQT15M are $3,500-$5,000 each on the used market. Just the annual hydraulic fluid changes on those two machines runs $1,400. Servo motor goes tits up? There's 12 grand or more.