First Upgrade on Remington 870 Express? Magazine Extension! Usually, the magazine extension is first upgrade which every Remington 870 owners installs: Remington 870 Express with Magazine Extension! Magazine extension installed on a brand new Remington 870 Express of one of the readers of the blog. Related posts: Remington 870 Dimples Removal Magazine Extensions for Remington 870 Rem 870 July 25, 2017 1202 No Comments 870, express, Extension, magazine, Remington, Upgrade Extension Rem 870 Related posts Remington 870 in Afghanistan, 2006 Remington 700 SPS with MDT (Modular Driven Technologies) HS3 LA Stock Chassis Remington Bankruptcy? It’s OK! Debt reduced by $700 million and received $145 million Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Notify me of followup comments via e-mail Name * Email * Website Save my name, email, and website in this browser for the next time I comment.