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Difference round system - oval system

Billinghurst underhammer rifle round system   The round system has a diameter of 36mm. The barrel is significantly heavier in this system.
The round system is approx. 1kg heavier than the oval design (see below).
     
     
Billinghurst underhammer rifle oval system   The oval system is 32mm wide. The WAF of the barrel is 28mm and is parallel.

 



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