look here
http://ukchineseairgunforum.myfreeforum.org/index.php
I suggest contacting an SMK dealer and asking them. See the link below
The SMK XS Super Grade 20 is a break barrel. That means you pull down on the barrel and load it through the back of the barrel after you cock it all the way open.
The SMK XS78 is a copy of a Crosman model 2260 sold in the USA. The SMK is sold in the UK. The Powerletts are loaded with the tips pointed in opposite directions. In other words Butt to Butt. The first powerlett faces nose in and the second one faced nose out. The loading chamber is under the barrel.
SMK Bahang - Penampang - was created in 1994-12.
SMK Puteri was created in 1993.
SMK Cochrane was created in 1957.
SMK Mambau was created in 1989.
SMK Puteri's motto is 'Kualiti teras kecemerlangan'.
SMK Majakir Papar was created in 1962.
SMK Seri Perak was created in 1958.
SMK Damansara Jaya was created in 1983.
SMK Green Road was created in 1964.