this is a great item if you are an old school imp fan, and with an original price of 100+ you can save yourself some coin. these things cut down the cycling time of your marker by a lot.. no more hearing the click click sound of outshooting the stock ram. you will be able to lower your dwell setting and thus increase your ROF. you do need to keep them well greased, there is a seal between the hammer and ram body that needs lube or else it will leak. oh yeah, and it comes with the stainless hammer, which works like a charm.