5.7x28 mm Insert Arbor Laser Boresighter Precision Machined Fit CMMG Bore Dia.
With Arbor diameter Precisely Machined to Fit all cmmg riflebore diameter.
It is a precision machined Arbor insert into the Muzzle
Class IIIa 635nM Less Than 5mW, Avoid Direct Eye Exposure to Beam.
Red Laser Dot Precision Laser Optics
Weught: 0.51 OZ