Fits -14mm CCW (If you need +14mm CW let me know so i can redo design) You choose whether you want a ring at the end or you want it flush. (If no answer, I will send flushed as a standard) Black PLA + PREMIUM MATERIAL Original "AOBS" design threads start deep into the design as opposed to traditional screw-ons at the beginning. To install: Firmly grip and rotate counter clockwise. Does not contain internal baffling, foam, etc . It is hollow . See technical drawing for more details . There is no guarantee that this can suppress or reduce the noise of your airsoft gun - it is simply a cosmetic item. This listing complies with eBay's air gun policy and I will only ship air guns to buyers in jurisdictions where permitted to by applicable laws https://www.ebay.com/help/policies/prohibited-restricted-items/airsoft-air-rifle-bb-guns-policy?id=5045 Feel free to any questions.