I believe I had swapped out the buttpad on one of my 300s with that on my 150.
In any case the hard plastic spacers between the wood and rubber don't ever seem to fit too well on the "correct" gun anyway
Check part nos for the 300 with the corresponding 150 item
http://www.waffencenter-gotha.de/sho...00S::2849.html
Ask them perhaps to make sure, probably it's just the style of rubber that may or may not differ slightly.
http://waffencenter-gotha.de/
http://www.sportwaffen-schneider.de/
"Schaftkappe" is the magic word
**WANTED**: WEBLEY PATRIOT MUZZLE END; Any Diana/Original mod.50 parts, especially OPEN SIGHTS