Check the listing for details. POWER ADJUSTER in Brass Chrome Black for Crosman CO2 (2240) OR Pump (1377) etc.. Condition: New. Listed at 42.88 USD. Another Alchemy AirWerks Exclusive Custom PartNew POWER ADJUSTERS in Brass, Chrome, or Black Available for either Crosman CO2 air guns (2240, 1740, 2250, 2300, 2400, etc.) OR Crosman Pump Air guns (1377, 1322, PC77, BackPacker, etc.) Note: Please also see my listing for the custom handles that EXACTLY match the knobs on these Power Adjusters. This upgrade allows you to fine tune the spring tension and stroke of your hammer spring. It is like having a variable length and tension hammer spring.It is variable, so it can increase spring power to the hammer cycle AND it can decrease spring power to the hammer cycle. You choose.Machined and assembled by us right here in the USA.Includes our 3D printed spring guide and a new hammer spring.Yes, these are a little pricey. There is lots of machine time and parts in these little beauties. This is made to last and features all metal (steel and brass) construction. It should easily last a lifetime.The body is powder coated satin black. The handle is your choice of gloss black, polished brass or chrome. These handles match the probe handles on my other listing. After installation, it allows adjustments in seconds without any dis-assembly again. Installation is simple: Remove the rear trigger frame screw into the tube, then remove the top rear breech screw into the tube (hold on as you do this because the old spring is pushing outward on it), remove the old hammer spring and the end cap, and finally replace with this new PA (power adjuster).This part is made in the USA.This Custom part is freshly new (not old stock) and has never been used or installed. This part is completely ready for you to install to your pump tube. With every order, I will ship within 2 business days (usually next day) and your order will have a tracking number as well.Feel free to email me any questions you may have.Please bid confidently. Excellent customer service has always been my most important goal. My feedback backs that up (and will continue to)._____________________________________________This is an Approved Item for sale per eBay Policy: *** PLEASE DO NOT REMOVE THIS LISTING *** This Item is for Air Gun Use Only... Not for Firearms_____________________________________________