Check the listing for details. COMBO-Ext.Strong Hammer Spring/RVA/Adapter for Crosman 2240/Discovery. Condition: New. Listed at 75.00 USD. COMBO - Custom made Extra Strong Hammer Spring - Rear velocity power adjuster - Custom made silencer adapter for Crosman 2240/2250 air gun/ Benjamin Discovery. Custom made Extra Strong hammer spring for your Benjamin Discovery or Crosman 22xx air rifle/gun. Made from quality 1 mm thick music wire. Get extra power from your air rig! Closed end, not ground type springs. (2 pieces) Using this spring will increase the pellet velocity, depending on the type of pellet you use, and increase your cocking effort. Also, it is most likely it will decrease your shot count, and increase your muzzle report,and most likely increase air consumption. You should measure and find a "sweet spot" for your particular rig, the one that gives 4% ES, depending on your fill pressure. Custom made rear velocity power adjuster (RVA) for your Crosman 2240/50 or Benjamin Discovery. It allows you to fine tune your air rifle. With this RVA you can remove the spring without disassembly of the air rifle. Material - blued steel/brass. Hex-Allen head. M10x1 thread. (1 piece) Custom made silencer adapter for Crosman 2240/2250 air gun. 1/2 - 20 UNF standard thread for common air gun/rifle silencers or LDC (lead dust collector). This will fit all 7/16" Crosman barrels (11,11 mm), adapter has been precision reamed to that dimension.Material is steel, blued. Securing is done with M4x0.75 mm or 8-32 grub screw. Inner depth is 30 mm. (1 piece) We ship worldwide, DHL Express, fully trackable. Please check our other listings. ESTIMATED SHIPPING TIMESEUROPE COUNTRIES: 1-3 DAYSUSA: 2-5 DAYSOTHER COUNTRIES: up to 10 DAYS This listing complies with eBay's air gun guidelines found here - http://pages.ebay.com/help/policies/firearms-weapons-knives.html This is not a silencer, or a silencer adapter for firearms, its an silencer adapter for air guns. Please be certain of the thread size you need for your adapter - if unsure, please contact us before making a purchase, to try to determine the proper size. Delivery time might vary depending on a large variety of causes. If the item gets processed by the Customs Office, it might take even more time. Your package may be subject to import duties, taxes, and other charges, which are not included in the item price or shipping and handling cost. These charges are the buyer's responsibility. So please check with your country’s Customs Office and regulations to determine what these additional costs will be prior to buying to avoid yourself any unnecessary trouble. We can't be held responsible for any additional cost that may be charged upon your package at your customs office.This is small item though, so we believe there will be no such charges. Given delivery times are just an estimate - distant destinations may take even more for delivery, or if item gets processed in Customs office for instance. If you don't like to wait, please have this in mind - we don't have any way to make this faster - once we ship it (and its usually the next day from the day of your purchase) we don't have any power over it. Once again, if you don't like to wait (and can't use regular messaging for communication) please consider shopping elsewhere. NOTE: ADAPTER - This is not a silencer! We presume that you are technically inclined for installation of this part, and that you aware of legal side of silencer usage in your country, legal power limits and that you have means to measure power output, so we can't be held responsible for any malfunction, power increase or damage to your air rifle.RVA Hex - We presume that you are technically inclined for installation of this product (that topic is well known and documented on numerous internet sites) and that you aware of legal power limits and have means to measure power output, so we can't be held responsible for any malfunction, power increase or damage to your air rifle. This is a drop in replacement - no fitting needed, but as described on numerous internet sites in some cases factory screws that hold the breech/trigger guard might be slightly longer and interfere with adjusters setup, and they need to be slightly shortened.Power spring - We presume that you are technically inclined for installation of this part, and that you aware of legal power limits and have means to measure power output, so we can't be held responsible for any malfunction, power increase or damage to your air rifle.If you are in some way unsatisfied with the item received, please contact us prior to leaving feedback. We strongly believe in customer satisfaction, and we are eager to give superb after sale service to all of our buyers.