Ian from Forgotten Weapons put up a warning about CETME-LC. This is the version with collapsable stock.
This version required some changes in design, which included lighter bolt carrier group as well as related parts. Unfortunately that meant faster cycle, resulting in firing pin striking the ammo due to the spring not being able to overcome the momentum.
Ian wrote more on his blog
and if are wondering how Ian's CETME-L is performing, here's use in a 2-Gun competition
From: Forgotten Weapons, Inrange TV