I have one Utah Airguns Picatinny Rail Extender that was installed very briefly on an FX Impact X. Price is $75 shipped via USPS w/tracking. No hurry to sell, so price is firm for now. Bought new for $100 plus shipping. Payment via PayPal Friends & Family fee-free service, or add the 3% fees for regular PP service with protection. Continental US only. Email me at [email protected] if interested.