.25 Calibre rated with 5/8 X 18 UNF thread. Certainly amongst the best sound moderators available in size / cost / performance equations. Solidly made and stand up to a serious amount of use for many years.
ANY and ALL Pre-used Sound Moderators I have should offer up perfectly acceptable performances. Certainly comparable to the equivalent model brand new. This Reflex T8 Compact is no exception. Given they are very likely to already be ‘carbonised’ internally there is every chance they will actually increase effectiveness. As with anything not brand new there is a chance they may well not last as long. However this IS reflected in the price. In reality, unless you are regularly spending hours on a range, there should be way over enough ‘life’ still there for the average shot.
The ONLY way to get maximum longevity is to dig that bit deeper and buy new. Happy to order those in where needed so just ask if you prefer.