Do you know what is considered a small size? I think my LMT upper has a .070 gas port. Is that small?
To be honest I do not. I normally accomplish it by taking a longer barrel and cutting it down.
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Do you know what is considered a small size? I think my LMT upper has a .070 gas port. Is that small?
.45acp or 9mm bolt action rifleWhat caliber?
Any blow back or gas run semi is going to be louder. Hell even roller lock rifles are loud. SCARs are loud. Your best option is a properly tuned AR with a slightly long barrel. My 18" AR is great and not gassy. Unfortunately right now there are no real great quiet options in semi auto 556 <16" barrel. Unless you want to pony up for a Dakota Tactical built HK clone.
I have an old ACR that I chopped the barrel on to 11.5" (small gas port). It is ok, but the gas port is so small it barely runs without a can, even with the adjustable gas system.
I also have a DD Ambush 6.8 that I cut to 13" (again small gas port). It is the quietest <16" semi gun I have that shoots supers. Gas is very minimal too. That would probably be my recommendation, but again you have expensive ammo to deal with. I love it though. I hunt deer and hogs with it, and have a dope card on it out to 650 yds. Pretty impressive for a 13" barrel.