Mad Bull Black Python 6.03mm Tight Bore for G17/18 M4 20mm underside rail for tactical

20mm underside rail for tactical lights or lasers

3 rough textured frame for improved slip-resistant grip

Dual-breech flex ball detents

Non-Blowback

Matte Black

Mad Bull Black Python 6.03mm Tight Bore for G17/18 M4 20mm underside rail for tactical6. 03mm ID Tight Bore Barrel for G17 G18Black Python is our experimental product. By using a hard coating process, our barrels can provide the smoothest inner barrel surface and a reinforced structure. NOTE: The choice of B. B.'s is very important. Our barrels are 6. 03mm in diameter. NOTE: You may find scratches inside the barrel after shooting. This is normal. All barrels will have the same effect if they are using a dark finish.