Check the listing for details. 3X Extra Long Foster Fitting Dust Cap Fits FX IMPACT M4 PCP. Condition: New. Listed at 11.99 USD. Fits FX IMPACT M4 Airgun! We are the ORIGINAL DUST CAP 3D PRINTED DESIGNER AND PRODUCER! F3D has Custom printed Flexible Dust Caps for foster fittings specifically for the FX IMPACT M4! The factory cap is too short, Replace them with these! They are flexible, and add that extra grabbing space to be able to remove them with ease. These extended Dust caps pop on with ease! NOT FAT OR BULKY! Works great on your foster fittings! 3 X Extra Long(XL) Dust caps per order! These Flexible WATERPROOF covers will FIT ALL Airgun Foster Fittings! They fit Brococks, Taipans, FX airguns, M3, MKII, MKI, FX Crown, AEA But are SPECIALLY DESIGNED FOR THE FX IMPACT M4. You will get 3 XL Dust Caps per order! Don't let dirt and debris into your exposed foster fitting! Place one of our dust caps on it! You get 3 x XL Dust Caps per order! - Colors available -BlackRedOrangeGreyBlueLight BlueGreenLime GreenPinkYellowCustom - Let us know what 3 colors you want per order! NO Airgun/NO Foster-Fitting/ is included in this listing USPS is SLOW lately, Please be patient with shipping as we ship our products quickly and cannot control USPS!