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 Cochrane was created in 1957.
SMK Puteri was created in 1993.
SMK Mambau was created in 1989.
SMK St. Anthony was created in 1932.
SMK Sultan Yussuf was created in 1907.
SMK Batu Lintang was created in 1977.
SMK Kompleks KLIA was created in 1999.
SMK Bhakti Anindya was created in 1987.