22LR Pistol Barrel length 3.5" Vs. 5" (inches) which is better?

[S2H]

Hello,

I would like to know if there would be a difference in suppressor db level with a 3.5" Vs. a 5" barrel length for a 22LR pistol?.

Thanks for your time
-S

[JeffWard]

From what I've read... 4.5" is the "magic length" where high-velocity ammo is still subsonic (quiet), and accuracy is not compromised. Going to 5"-5.5" MAY allow some high-velocity stuff to go super-sonic, especially with the added length off a can.

I run a 4.5" CMMG barrel on my AR-22 Pistol, and it sounds like a stapler... and shoots thumb-nail size groups at 25 yards.

Jeff

[TomServo]

+1 for 4.5". That is what I have my pistol and SBR AR cut to and both keep standard ammo subsonic. At least, the ammo I have tested so far. Accuracy is surprisingly good, too, at reasonable ranges.