Are you building a CETME L from a kit? Do you want spares to keep your MarColMar CETME L in top condition? This is a newly manufactured buffer spring developed from extensive high-speed video and photographic analysis of the CETME L action under fire. This spring is essential to keep the bolt and carrier from impacting and damaging the buttstock. When this happens there is a large increase in felt recoil... if your rifle has developed this, you definitely need a new buffer spring!