Looking for buttstocks for your CYMA AK? You're in lock as Get Reload have two types of buttstocks for such. The first one is the folding stock for the AK AEG made of high density polymer, whilst the second one is an AK 6-position buttstock made of fibre nylon and metal to give that AK AEG yours that PMC AK look. Links to the product pages below.

CYMA AK (CM028) Folding Stock (C.60)

CYMA 6-Position Sliding Stock Set For AK AEG (Black)