The ptw is a take on the standard aeg, however it is far more refined and efficient. Systema does now make a recoil model, but the traditional ptw doesnt have recoil. The way the gearbox and cylinder assemblies were designed makes the system far more efficient and consistent, while also making it fairly user friendly and reliable. The only downfall for most ptw's is the motor which tends to be the most common point of failure. This can be remedied however by having the motor rewound which makes the system far more reliable.
And in regards to precocking, it really isnt necessary for a ptw due to how quick they already are. Some people do this on certain aeg builds to aid in trigger response, but it puts a lot of strain on the system and isnt always necessary.
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