There is a line drawing in c. 1978 Small Arms of the World which is also in Nelson & Lockhoven IIRC, it shows the ["current" baffle stack e.t.a This is wrong from review of the drawings] with a piston passing thru the top of the baffle stack and flapper (presumably located where the screws on either side of the casing below the front sight).
Pachett L2A3 Silenced Version
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Sterling L34A1 / Mk5
So the pictures in Small Arms of the World are of the L34 type baffle system. The line drawings of both are in "the World's Machine pistols and Submachine Guns" by Nelson and Musgrave. printed 1980 and still one of the best reference books available. The whole series (starting in 1963) is highly recommended.
Attachment 95544
It appears to only have a single reflex type baffle, similar in concept to the end cap. The space between the baffle and the front sight housing appears to have space for several more baffles.
Attachment 95545
Attachment 95547
Attachment 95546
https://www.milsurps.com/showthread....l=1#post387183 Link to post 31 (serial number list)