This is a machined aluminum Armalite buffer tube for side folding AK’s conversion. Suitable for AKS74 & 100 series (AKs74, AKs74u, AK104/105) made by 5KU. Great looking & feeling quality. Weight: 100g (very light). This does not work for my E&L AK’s. It’s intended for CYMA’s. Maybe for LCT’s. So, it hasn’t been installed or messed with. Brand-spankin’ new. No additional cost for shipping.