Barrel inserts

Barrel inserts are designated for installation of bore sight collimators on weapons. They are being produced with fixed calibres of 5,45 mm; 7,62 mm and are being smoothly adjusted:
 

A1
5,33 ÷ 6,85 mm (0,21" ÷ 0,27")
A2
7,0 ÷ 9,14 mm (0,276" ÷ 0,36")
A3
8,89 ÷ 11,43 mm(0,35" ÷ 0,45")
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