Is this what you're after? https://www.actionhobbies.co.uk/products/systema-ptw-m4-mid-cap-steel-used/
and they are nice and grungy just what I wanted and they are nice and grungy just what I wanted 
and they are nice and grungy just what I wanted 
https://www.actionhobbies.co.uk/products/systema-ptw-m4-mid-cap-steel-used/