The Hornet system is unique to the Leshiy 2 Line.  This modular system allows the user to adjust the length of the Leshiy 2 by adding or removing baffles.  Need extra quiet for backyard safaris, add a couple of stacks, fit in an EDC pack, shorten the MOD50 and fit almost anywhere.

The MOD50 is the largest diameter (50MM) in Huma-Air modular air moderators. It consists of an extra-long start chamber with vent holes to dissipate the excess air from the muzzle blast, and it is equipped with fixed threads (available in several sizes), three extra 40 mm long volume chambers, and an endcap. These four chambers are filled with wired metal inserts wrapped with our special Kevlar ® enforced ballistic fibers to minimize the sound. Despite the large dimensions of this moderator, we succeeded in keeping to weight extremely low with just 311 grams, which makes it suitable for many air rifles.
This system allows you to configure your silencer in terms of length, caliber, volume chamber size, and content of the internal silencer chambers.  Now offered in the 350MM barrel length, keeping the overall length as short and quiet as possible.  The new 350MM Hornet has an expansion chamber and air stripper at the first baffle 

The set comes with a unique black anodized precision aluminum adaptor to fit the moderator to the Leshiy 2.

You can add or remove volume chambers with different lengths, volumes, and internals.
By mixing these variables, you can influence your silencer's frequency and output decibels and adjust them perfectly, matching your rifle.

The REPR is a transverse or perpendicular micro regulator that is only a few MM tall.  It uses a cup that is screwed into the plenum sideways.  A mini Belleville washer stack is used along with a single-piston O-ring.  A debris plug is placed between the air reservoir and plenum that prevents contaminants from entering the regulator.  The REPR can regulate the plenum pressure between 60-280 BAR.  The black disc is used to either increase or decrease pressure in the plenum.  With the REPR,  increase and decrease of the regulator pressure can be done while the gun is fully charged; no need to degas the Leshiy to adjust the regulator.
Additionally, the REPR is equipped with a removable plug with 1/8 BSPP threads; this is used to check the plenum's pressure if desired.    The key to this system is not the volume of the plenum nor the fact that the pressure can go so high - but the combination of the patented valve and high-pressure regulator.  No need to waste money on "power plenums" or other snake oil items.,  Leave those upgrades for traditional valve systems.  The new REPR comes complete with everything you need, straight from EDgun.  Ed has a tradition of selling guns that don't need aftermarket gizmos to ensure performance.  The new REPR is ready directly from EDgun without paying for extra items.