| 1. | The primary feature of the XM307 is its attenuated recoil system.
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| 2. | Locked recoil systems rely in timing to allow safe operation.
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| 3. | The AL391 has a self-compensating gas-driven recoil system.
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| 4. | This lacks the mechanical simplicity of some other recoil systems.
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| 5. | This balanced recoil system is derived from the AEK-971 rifle.
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| 6. | The introduction of recoil systems was an important milestone.
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| 7. | These guns were air-cooled and used a gas blowback recoil system.
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| 8. | The original 1885 Mk I lacked a recoil system.
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| 9. | The barrel was mounted in a ring cradle with a hydropneumatic recoil system.
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| 10. | The MP-6 used a short recoil system.
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