Big Bore LDC

I have two Neil Clague LDC's, one for my Sam Yang 909s, and one for my Marauder .25. The LDC on Marauder makes it super quiet, to the point that impact is louder than rifle, and I really only hear a spring inside the gun. It's amazing. 

The LDC on my Sam Yang 909s makes it have a reasonable sound level. Not backyard friendly, but I know of no big bore that's backyard friendly period. 

And... neither LDC changes my POA. I've had others that totally change POA. Not Neil's.
 
Call Donny and he will tell you which one of his moderators to use on your rifle for the best results. He will even make you a custom moderator for your rifle should that be necessary. I strongly recommend you go with the DonnyFL...his moderators are machined to perfection, they can be disassembled for cleaning, and his customer service is spectacular!