ZCI V2 Stainless Steel Ball Bearing Spring Guide

Do not buy these. I've had two of the three I ordered snap right at the base. A poor grade material is used at the bottom but the shaft and top are of good quality. I also had to epoxy the top in place as they aren't (at the time of this review) secured at all. If the bottom snaps after simply installing an M130 spring it doesn't matter. Stay away from ZCI Ver. 2 spring guides until this is sorted. I also experienced issues with their Aluminum Ver. 2 spring guides. Poor design/ materials.