Threaded reduction for SA 61 and its variants

Threaded reduction for the SA 61 submachine gun and its variants from Navrátil Arms.
 
It gives the possibility to clamp a silencer and other muzzle devices. 
A collet is used to clamp the barrel, which is fitted with two pairs of M4 screws. 
Installation does not require any intervention on the weapon.
The reduction can also be used on other weapons with an outer barrel diameter of 12 mm.
The thread cap is included in the package.
 
The thread for clamping the accessory is sizeM14×1and 5/8″x24 UNEF.
 
The reduction is compatible with the SA 61 Defender MK.2 upgrade kit
 
TECHNICAL DETAILS:
Caliber: 7.65 mm Browning
Thread: M 14×1, M13.5×1 LH, UNEF 5/8″x24
Barrel diameter: 12.00 mm max
Length: 48 mm
Weight: 103 g
Material: refined steel
Surface treatment: sandblasted, alkaline oxidized