I very much agree with Vinjak (above) on the STO insert.
Below is from a prior post-
I have an EDgun L2 350 .22 cal.
After trying numerous moderators (DFL, Huma, various 3-D printed shroud inserts, etc) none in my gun, works better than the STO Shroud insert that replaces the Edgun Factory insert See below:
The Edgun Leshiy II has packed a lot more into an already small space and considering the success of our Leshiy Classic core it was time we tried our hand at this new and interesting rifle. Unfortunately, the factory shroud core is not very well optimized and this, combined with the considerable pow
www.silentthunderordnance.com You can get added effect with additional moderator using the end cap replacement.
The end cap replacement with 1/2 x 20 threads is this:
1/2-20 threaded adapter for EDgun Leshiy 2. Replaces the end cap on the factory moderator to accept muzzle attachment with female thread.
striplincustom.com
Nothing I have found will stop the action/indexing noise at your ear.
These make the biggest difference in noise reduction when standing away for the gun.
Also the Behemoth quick connect moderator is coming out soon and looks and sounds very promising. Brian at EDgun West demonstrated it to me over the phone and it was most impressive.
It will change the look of the gun. However, you can also add this as an add-on with end cap replacement or directly to the barrel.