I bought mine from Brownells also...I sent it to Geiselle for modification...Unfortunately, I won't have a Nucleus action for many months to see if it works...I am anxious for someone to test the modification and post about it...Seems to me you have two options. 1. Send it back to Brownells. or 2. Contact Geiselle and return it to them for modification. (I had better luck emailing Geiselle sales, rather than using their contact form on their web page. Although, I eventually did get a response after using both methods... I'm unable to use the telephone due to hearing loss.)Recently received a Super 700 from Brownells during their last Geissele sale. No dice on my Nucleus action. Pull the trigger all you want, nothing’s happening.