Quote Originally Posted by T 20 View Post
It's hard to advise you without knowing the MK1's serial number, Mark --- the serial number gives the date of manufacture.


Early MK1s had a metal rear sight, metal piston, and metal breach, eventually all these components were replaced with plastic.
From memory, the piston changed to plastic in November 1978 and the breach changed to plastic in February 1979, so a late MK1 is no better made than a new one.

The front grip is held with roll pins not screws.



All the best Mick

Thanks Mick, serial number is 478003115, hope you know how to decipher it!