Call NEF at their toll free number listed in the FAQ and Help sticky, tell em exactly what, when and how. Ask them to issue a call tag or reimburse you for shipping if they will, warranty coverage is 1yr, but they're real good about working with you. They may not cover shipping, but I bet they will fix it for you. You may be able to just ship the frame without the stock and barrel, ask when you call NEF, I'd ship it USPS priority mail if they will, I use their Click-N-Ship, saves me from standing in line, but you need to know the weight on the parcel.
http://hr1871.com/repairs/index.htmhttps://sss-web.usps.com/cns/landing.doAnother option if you are the DIY kind, ask em to send you the lifter and striker to install yourself, they have done that before for several members. Use Perklo's instructions in the FAQ for a trigger job to learn how to R&R it.
Tim
USPS Retired