<unk> <unk> <unk> <unk> <unk>  Passage: The NR-30 was a single-barrel, short recoil operated cannon, essentially an enlarged version of the 23 mm NR-23 weapon introduced in 1949. It fired a massive projectile (more than twice the weight of the NR-23's 23 mm shell), requiring a muzzle brake with an integrated flame damper to prevent airframe damage from its firing.<unk> It fired a massive projectile (more than twice the weight of the NR-23's 23 mm shell), requiring a muzzle brake with an integrated flame damper to prevent airframe damage from its firing.<unk> It fired a massive projectile (more than twice the weight of the NR-23's 23 mm shell), requiring a muzzle brake with an integrated flame damper to prevent airframe damage from its firing. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ 23 mm<unk> was quite powerful, but with a relatively low initial velocity, while the 37 mm<unk> was lacking in rate of fire and ammunition reserve.  Question: What kind of brake does it require?
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